I'm OK with U2. I liked their first several albums a lot and I have enjoyed quite a bit of their later material.
I don't mind Bono's political activism. U2 has always been a very political band, although a lot of it was directed more at the UK early on, they certainly have not steered clear of being critical of the US. I think one of the greatest things about America is that we have a free society where even a foreign national can criticize our government in live concerts and on the radio in America without any legal repercussions. I'm OK with that. I think America is strong enough, as an idea, to be criticized, and the discussion and introspection that comes from criticism only makes us a better place. At least, that is how I imagine it works, or is supposed to work.
You can hate Bono as much as you like, and you can disagree with his opinion, and you can even stop buying his records, as you have the same freedom he has. You can post about it here, you can write a book, or whatever. It is a good thing.