Why do you think this? His public and private actions generally seem to support the idea that he is ethically grounded, and I'm unaware of questionable behavior at any point in his earlier career. But I'm not that old, so I don't know who he was in the 70s.
I have nothing against Buffet. I just think that you can't become a multi-billionaire by being a nice guy. You have to be ultra (pathologically?) competitive and ambitious to get that far.
