In his AMA he contrasts his younger self from other young billionaires and millionaires by stating that they are often much more interested in "giving back" than he was until he was much older. He was a ruthless man who cared only for himself in his younger days and that led to some rather unethical business practices. It wasn't until much later that he chilled out and learned some compassion for the rest of the world.
Big contrast from Bezos, Jobs, Ballmer.