Unpopular opinion: I think a lot of people use charity/philanthropy as a cover to prevent scrutiny against other less than stellar things they have done. See Clinton Foundation, McCain Institute, etc.
Cover? That's your response to the Gates Foundation's philanthropy—that it's cover for shady stuff? Really? Whatever did they do that was so horrific compared to everything the foundation has achieved?
I read a really interesting article some years ago how the rich setup charity foundations to hide from taxes. I donate to your foundation some large amount and you do the same.
Then employ your family members to run the foundation and pay them a huge salary.