Far from being a Black Swan, that's easily explained by human nature. Our greed and hubris make us susceptible to financial bubbles and various other get rich quick schemes. Without regulation and enforcement to keep us in check, financial markets will default to bubbles and crashes.

We are warped from birth, true human nature hasn't been seen around this joint for eons. Greed and hubris are learned qualities. Not to disagree with your point about them being our current susceptibilities though.