I try to separate my politics and my music, as well as the artist from the music. If I didn't, my music library would be incredibly small.

To put is simply, people are complex. One person's angelic saint is another's horrible monster--and I'm pretty sure every musician has done something wrong to someone, somehow, to some degree. So, I buy the music that I like and stay largely ignorant of an artist's history or political views--and even then, there are some people whose music I refuse to buy.