Beyond that, while I'll certainly admit that government has a ton of problems, I'm not sure that the best model for funding -- for example -- research into various diseases is to put decisions under the control of rich people in the private sector, no matter how "reformed" and generous they seem. Or that super-rich people deserve to have praised philanthropic legacies because they managed to game the system during some point in their lives at the expense of income inequality and unfair markets.
Granted, Gates doing good with his money is orders of magnitude better than him sitting on it doing nothing, but I don't think he deserves all the praise he's been getting, given his background.