Why do people, and especially this topic, complain so much and focus on the negative?

I call it the "pussification" of the American male. Everyone is whining, complaining, bitching, moaning, griping, etc...

Why not focus on the positive! Be optimistic, create hope where there is none, try to get the most out of the little you have?

Life is too short to focus on the negative; embrace that plastic case?