Wishful thinking

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Wishful thinking is the formation of beliefs and making decisions according to what might be pleasing to imagine instead of by appealing to evidence or rationality.

Studies have consistently shown that, holding all else equal, subjects will predict positive outcomes to be more likely than negative outcomes. See positive outcome bias.

Prominent examples of wishful thinking include:

Economist Irving Fisher said that "stock prices have reached what looks like a permanently high plateau" a few weeks before Stock Market Crash of 1929, which was followed by the Great Depression.
Operation Barbarossa, Hitler's plan for the invasion of Russia.
British Prime Minister Neville Chamberlain informed the public that the 1938 Munich Agreement guaranteed "peace in our time".
President John F. Kennedy believed that, if overpowered by Cuban forces, the CIA-backed rebels could "escape destruction by melting into the countryside" in the Bay of Pigs fiasco.

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As a logical fallacy

In addition to being a cognitive bias and a poor way of making decisions, wishful thinking can also be a specific logical fallacy in an argument when it is assumed that because we wish something to be true or false that it is actually true or false. This fallacy has the form "I wish that P is true/false, therefore P is true/false."Template:Ref

For example:

The teacher gave us a difficult exam! We shouldn't have to be subjected to such stress under the course of our education.

It may be that it was uncomfortable, but that does not mean that uncomfortable things should always be avoided. Wishful thinking underlies appeals to emotion, and is a red herring.

Atheists argue that much of theology, particularly arguments for the existence of God, is based on wishful thinking because it takes the desired outcome "God exists" and tries to prove it on the basis of a premise through reasoning which can be analysed as fallacious, but which may nevertheless be wished true in the mind of the believer.

A related fallacy is "It hasn't been proven false, so it must be true." For instance, a believer in UFOs may accept that most UFO photos are faked, but claim that the ones that haven't been debunked are genuine.

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