Why are American CEOs so greedy?

Most Ceo's are selfish and greedy. They only care about the few and not the many. They care only about their board members and no one else matters to them. They are the reason we had this financial meltdown. Most of them should executed for making decisions based on greed.

all ceo's of american companies are so greedy they don't care about their employees or customers just profit and their ugly huge bonuses so fire all of them. when their employees complain about company policies they just shrug it off like nothing and when customers complain they just laugh, it's sad and all these ceo's shut be put to a firing squad.