Why isn't greed used for good?

You know, philanthropic goals being fulfilled by short term greed leading to the long term benefit of humanity.  Bill Gates founding a college or McDonald's donating to charity are small examples of this, but more obvious ones would be greed through harnessing cleaner fuel sources, or feeding third world countries, providing shelter, etc.  Companies still make money, but get to benefit humanity as a whole.  Or is this too Green Party thinking?

In the richest nation on Earth, that can afford the best infrastructure possible? That actually had a reliable system until the private sector took over?

Do you guys know anything about history, or do you just jack off over the intellectual beauty of your political beliefs?

What a bunch of apologists.