We are living in a global society that has been structured around the singular principle of individual enrichment, and have been for about 230 years, depending on where you live. The answer to almost all modern mysteries of human behavior will lie in that incentive structure one way or another.
Why do people steal of defraud? The potential individual enrichment is higher. Why engage in corrupt short-termerisms like accepting bribes? individual enrichment.
This is all the result of "greed is good" ^1 and its not sustainable.
1: https://www.theatlantic.com/business/archive/2014/04/greed-i...