Democracy is beautiful in theory; in practice it is a fallacy.
The fallacy of monetary policy in the U.S. is to believe this money will go to the man on the street. It won't. It goes to the Mayfair economy of the well-to-do people and boosts asset prices of Warhols... Very happy. Very good for the Fed. Congratulations, Mr. Bernanke.
You can't recover memories of a missing event. That's a fallacy.
The Republican argument that raising the debt ceiling encourages additional future spending is logically irresponsible. The debt ceiling has to be raised to authorize spending already approved by Congress. Despite that fallacy, the GOP has been able to score political points with its argument.
That fallacy flies in the face of studies that show, every day, in every way, things are getting a little worse for America's minorities relative to the progress made by those in the top percentiles of assets and income.
Privacy with medical information is a fallacy. If everyone's information is out there, it's part of the collective.
Science is simply common sense at its best, that is, rigidly accurate in observation, and merciless to fallacy in logic.
I think it's a fallacy to say that a good book sells itself. It doesn't happen. I'm a voracious reader and I can give you a long list of books which should have been best sellers but they aren't. How can you buy a book if you haven't heard of it?
The planning fallacy is that you make a plan, which is usually a best-case scenario. Then you assume that the outcome will follow your plan, even when you should know better.
The idea that a war can be won by standing on the defensive and waiting for the enemy to attack is a dangerous fallacy, which owes its inception to the desire to evade the price of victory.