My view is greed (at all levels high to low) keeps people coming back day after day to gamble in the market, and fear keeps them from getting close to what they would like to achieve. I am clueless about your "hindsight armchair reading" as related to fear and greed. However, if you mean...
'Should' is the achilles heel for analytical math wizards....PhD math wizards are worse, because they actually believe their work is infallible, due to being a certified expert in their field of math, or statistics. It boils down to being a human being with emotions, feelings, and anything but...