Because childhood bullies have psychopathic tendencies and lack empathy, a great set of traits that are rewarded in a capitalistic system when they become adults. Capitalism tends to reward the worst of our species with the greatest amount of power and wealth.
Sadly that’s untrue, it’s simply human nature. Bullies are usually in the popular, social, etc group. And when they pick targets they usually pick people with weaker mentality, personality, or are odd and unusual. One such personality are people who are unempathatic, lack social skills. In a sense they target people that don’t fit in.
Kids who grew up as bullies get rewarded later in life because they’re simply more social and more likely to start businesses.
Obviously we can’t speak with broad strokes in all cases however it’s a common observation.
