I'm not sure why Bloomberg is trying to paint U2 or Bono as being evil capitalists in this article. Maybe somehow they don't think it's possible to be good business people and want to make a difference in the world? Just because Bono doesn't declare all his charitable giving - is that bad? I think it's pretty much on record in other various sources that Bono believes in both tithing and giving offerings - in addition to the donation of his time, his name and his talents to all of these charities - many of which wouldn't be seeing nearly the contribution level if he wasn't out there chatting them up.
So, here's my advice to Bloomberg - spend a little more time giving and less pointing. It will make this a far happier world.