As I've alluded many times before: just read a few pages of the Investment Thread and you'll get a glimmer of the root of "corporate greed". Of course the compensation executive staff takes home is appalling. But it's a molehill, not a mountain.
Capitalism primarily reacts to the demands of shareholders. And shareholders will dump the stock in a heartbeat in favor of a competitor which provides higher returns...leading to fired CEOs who take golden parachutes, only to be replaced by even higher paid CEOs in an effort to rebuild shareholder confidence.
Deregulate the beast to this degree, and the personal "greed" of millions of investors leads to this.