Fallacies 2 - Michael Johnson

Fallacies 2 - Michael Johnson

Fallacies 2 IS THE EVIDENCE RELIABLE? Appeal to Probability Just because something is possible does not mean it is true.

Sample Student Homework Ancient Aliens is misleading because on the show they claim that alien technology was needed to move the stones for the pyramids. But people could have moved the stones in some other way.

Appeal to Probability 1. The show says there was only one way to move the stones: aliens. 2. Maybe there were other ways to do it. 3. Therefore, there were other ways to do it. 4. Therefore, the show is misleading: there is not only one way to move the stones.

Give Me Another Explanation! You cannot prove that the show is misleading by saying maybe it is saying something false. You have to show that it is saying something false.

Argument from Ignorance Absence of evidence is not evidence of absence. Carl Sagan Just because there is no evidence that something is true, does not mean that it is false. Just because there is no evidence that something is false, does not mean that it is true.

Argument from Ignorance The argument from ignorance goes like this: You cant prove that God doesnt exist. Therefore God exists. It assumes that because there is no argument against a position, that that position must be correct.

Shifting the Burden of Proof A similar fallacy is shifting the burden of proof. It goes: God exists. If you think otherwise, prove that he doesnt! Here, you make a claim (God exists) but instead of giving evidence for it, you require that your opponent give evidence for the opposite.

Just Asking Questions Frequently, conspiracy theorists will use a subtle form of the argument from ignorance: Is X true? I dont know. Im just asking questions. [No arguments are presented for thinking X is not true] [Audience invited to conclude that X is true.]

Just Asking Questions Some people think that George W. Bush was responsible for the 9/11 terrorist attack in the US. Was he responsible? Was the US Government trying to invent a reason to attack Israels enemies? I dont know. Im just asking questions.

Argument from Incredulity Similar to the argument from ignorance is the argument from incredulity. This happens on Ancient Aliens all the time: I cant believe that X is true. Therefore, X is false.

Cousins? Ad Hominem You cannot show that someones claim is false by showing that they are a bad person or that they are not an expert. You can show that we have no reason to believe them. But to show that their claims are false we

need to have evidence that their claims are false. Erich von Dniken Author of Chariots of the Gods in 1968. One of the first to argue for ancient astronauts/

ancient aliens. Inspired many of the people on the show. Erich von Dniken Left school at 19. Does not have a college degree.

Does not have a PhD. Has never received honors, recognition, or rewards from experts. Has been convicted of fraud twice. Appeal to Motive

A version of the ad hominem fallacy is the appeal to motive. You cannot show that a claim is false by showing that the person making the claim has a strong reason to believe it or a strong reason to make you believe it. Sample Homework Ancient Aliens is

misleading because in the show, they present Erich von Dniken arguing for the claim that aliens visited the Earth long ago. But von Dniken wants you to believe that so you will buy his books and

make him rich. Another Example: AGW Conspiracy Global warming is a multibillion-dollar worldwide industry, created by fanatically anti-industrial environmentalists,

supported by scientists peddling scare stories to chase funding, and propped up by compliant politicians and the media. Distribution Fallacy The distribution fallacy is committed when we

assume that individuals have the properties of groups they belong to. Lingnan has an excellent philosophy department. I am a philosopher at Lingnan._________ Therefore, I am an excellent philosopher. Distribution Fallacy

Kooks and quacks will often try to make their theories sound better by association: Having a PhD. Making ones work sound science-y. Debating serious scholars. Associating oneself with respectable institutions (Stanford, Smithsonian, etc.)

Genetic Fallacy The genetic fallacy seeks to evaluate a claim on the basis of its origin. So, for example, someone might say, Eugenics is wrong, because the Nazis began it and did horrible things for its sake. Eugenics may be wrong, but the fact that the Nazis began it is irrelevant to this claim.

False Balance False Balance Often newspapers will present two sides of an issue equally to provide balance. Objectivity is good and biased reporting is bad. But it is the responsibility of the news media to

present things in a way that accurately reflects what we know to be true. False Balance False balance happens when: An issue is presented as having two sides when no knowledgeable experts disagree. Two sides to an issue are presented equally

when one side has much more evidence than the other. One side is allowed to present fallacious arguments designed to mislead without the reporter(s) indicating this. Teach the Controversy

Teach the Controversy Fallacy of the Mean Candidate 1: We should raise taxes on everyone Candidate 2: We should cut social programs Therefore, Compromise: We should raise taxes on everyone

a little and cut social programs a little. The Fallacy of the Mean Lol, debunked. Not exactly. There are always two sides to a coin and the truth usually lies in the middle. Of course not everything on Ancient Aliens is totally true. Of course, not everything on this video is unbiased either.

internet commenter Darkeus regarding Chris Whites film Ancient Aliens Debunked Tu Quoque Tu quoque is Latin for you too. Its a defense of an invalid argument that goes: Youve made a similar argument. So you cannot criticize the flaws in this argument.

Just because other people are doing it doesnt make it right! DOES THE EVIDENCE SUPPORT THE CONCLUSION? Appeal to Popularity

Millions of people around the world believe that we have been visited in the past by extraterrestrial beings. Narrator from Ancient Aliens Appeal to Popularity What I am saying is that there is doubt. Millions of people believe in God in the US, so to teach

to kids (again under the age of 18) only one side of something that could be something else is misleading. comment from the internet Appeal to Popularity Indian astrology is famous in the entire world. From ancient time astrology has been improving in this country. Millions of people believe in

astrology with which the way of life can be smooth. Proper guidance can make a person able to combat against the problematic situations and unexpected happenings. A good astrologer can really give this guidance. article about astrologers in Delhi Appeal to Tradition

[India] is also home to some of the oldest records of ancient technologies. Ancient Sanskrit texts, dating back as far as 6,000 BC describe in varied, but vivid detail, flying machines called

vimanas Narrator from Ancient Aliens Appeal to Tradition With a history of more than 2000 years, Traditional Chinese Medicine (TCM) has

formed a unique system to diagnose and cure illness. eastday.com Red Herring Red Herring

What Does It Have To Do with Aliens? The wings are not shaped like normal bird wings. The tail is vertical rather than horizontal. Thats not how bird tails look. The wings curve down as they move outward from the bird. This would help something fly. The wings are thicker in the middle and thinner

at the edges. This would help something fly. Appeal to Nature: Meat Eating Your statement that "we were born to eat meat" is nonsense. In using comparative anatomy to determine what man was "meant" to eat, we should look at the species most similar to man, namely the anthropoid apes chimpanzees, gibbons, gorillas,

and orangutans. Of all animals, man's digestive organs and teeth most closely resemble these apes. In captivity, some of these animals will eat meat if forced to rather than starve to death. But in the wild, all eat a vegetarian diet. Eating a Slow Loris

Appeal to Nature: Medicine Taiwan has the highest per-capita incidence of UUC (upper urinary tract cancer) of anywhere in the world. Plants of the genera Ephedra and Asarum produce the toxic chemical aristolochic acid which causes UUC. TCM herbal remedies contain lots of these plants,

and tests have shown they contain aristolochic acid as well. Appeal to Nature: Homosexuality Because of this, God gave them over to shameful lusts. Even their women exchanged natural sexual relations for unnatural ones. In the same way the men also abandoned natural

relations with women and were inflamed with lust for one another. Romans 1:26-27 Born This Way Don't hide yourself in regret, Just love yourself and you're set

I'm on the right track, baby I was born this way Ooh, there ain't no other way, baby, I was born this way Baby, I was born this way Homosexuality in Nature

Homosexual behavior has been observed in as many as 1,500 animal species. For example, about 1/3 of albatross couples (pairs that bond for life) are made up of two female albatrosses.

Appeal to Nature: Evolution According to the theory of evolution, the strong survive and the weak die. Greed and aggression are traits that humans have because they have helped us in the past to succeed against people who share and are nice. So, according to the theory of evolution, greed

and aggression are natural and good. But they are not good! So evolution is false. False Equivocation Equivocation (or false equivocation) is when one word is used with two meanings in the same argument, rendering it invalid.

Silly Example God is love. Love is blind. Ray Charles is blind. So, Ray Charles is God.

False Equivocation If evolution is true, then we should expect that creatures act selfishly. If evolution is true, then creatures ought to act selfishly. But we know that its morally wrong to act selfishly. Creatures ought not to act selfishly.

So evolution is false. Post Hoc Ergo Propter Hoc https://www.youtube.com/watch?v=-_ 0_suZntks THE MOST IMPORTANT LOGICAL

FALLACY The Fallacy Fallacy This is a bad argument: 1. You have presented argument A for your claim C. 2. A is a fallacious argument. 3. Therefore, C is false.

Critical Thinking Is there any evidence to support the claim? Is the evidence reliable and trustworthy? How reliable is it? Should you accept it? Does the evidence actually support the claim? Is there other evidence you should consider?

What CT Can Do Critical thinking can show that there is no evidence. Critical thinking can show that the evidence is unreliable or untrustworthy. Critical thinking can show that the evidence does not support the claim in question. Critical thinking can (sometimes) reveal the

other evidence you should consider. What CT Cannot Do Critical thinking cannot (by itself) show that a claim is false. It checks arguments and makes sure they are not fallacious. Only hard work and real-world investigation can

show that claims are true or false. What I Did Demonstrated that some arguments for Ancient Alien Theory are fallacious. Demonstrated that some arguments against global warming are fallacious. Demonstrated that some arguments against

the theory of evolution are fallacious. Demonstrated that some arguments for/ against homosexuality are fallacious. What I Have Not Done Show that Ancient Aliens Theory is false. Show that Anthropogenic Global Warming is true.

Show that the Theory of Evolution is true. Show that homosexuality is good/ is bad. ECOLOGICAL FALLACY Ecological Fallacy Heres an ecological inference. Countries where, on average, people consume

more fat have higher rates of breast cancer. Therefore, consuming more fat leads to a higher risk of breast cancer. Theres a potential problem here with confounding variables. Maybe countries that consume more fat, on average, are also countries that have more

pollution, on average (perhaps because pollution and fat consumption both correlate with poverty). So maybe its the pollution and not the fat that causes breast cancer. Ecological Fallacy But lets assume we know there arent any confounding variables. Does the premise support

the conclusion: Premise: Countries that on average consume more fat on average have higher rates of breast cancer. Conclusion: Consuming fat leads to a higher risk for breast cancer. Ecological Fallacy But the conclusion doesnt follow.

Suppose that in Country A (10 people): 5 people eat 4 pounds of fat a day. 5 people eat 0 pounds of fat a day. Average fat consumption: 2 pounds/ day. Ecological Fallacy In Country B (also 10 people): 5 people eat 2 pounds of fat/ day

5 people eat 1 pound of fat/ day Average fat consumption 1.5 pounds fat/ day. Country B on average consumes less fat. Ecological Fallacy Now assume that in Country A, all 5 people who consume no fat get breast cancer. And in Country B, no one gets breast cancer.

So on average, Country B consumes less fat and has a lower rate of breast cancer. Country B consumes more fat and has a higher rate of breast cancer. Ecological Fallacy But still, this doesnt mean people who consume more fat are more likely to get breast cancer.

Its the people who consume no fat that get cancer! Ecological Fallacy A famous (purported) instance of the ecological fallacy was Durkheims argument that since suicide rates in Catholic countries were lower than in Protestant countries, Catholics were less

likely to commit suicide than Protestants.

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