Or if this is just hyperbole, perhaps accept that Sturgeon's Law is valid even for human behavior in relation to finance and economics?
People were making unbelievably stupid decisions and came up with the most ridiculous rationalizations for "investing" in the dot-com bubble. Same thing with real estate a decade later. It is not just because a market is overheated that we should dismiss the industry entirely.
(I am not saying that those with better judgement should just go and exploit the irrationality of the masses. What I am saying is that there is no way to argue anyone into making rational decisions.)