I can't believe anyone would question his human worth! Have any of you heard of the
Bill & Melinda Gates Foundation which is the largest transparent charity in the world? He, along with Warren Buffet, has put up HUGE amounts of money to help with global health and development. I can't say that he's Andrew Carnegie reborn, but compared to Wal-Mart's Waltons he's a saint. Keep in mind Gates did win Time magazine's person of the year for his philanthropy.
Just imagine if you could use billions to help the world, would you have done what he did earlier in life in order to do it? I think the answer is yes.
If you're interested, wikipedia has a great page on his charity
here.