Pink Floyd and Politics

Short one, conservative Pink Floyd fans confuse me. Recently Roger Waters on the Us+Them tour has gotten very political and a bunch of conservatives walked out on his show. To which I say, why are you shocked!? Pink Floyd has been very political over the years and yet all of a sudden now you realize that the socialist man on stage is a socialist and dislikes the current politics because he said it. But apparently when he sings it you don't notice. This is why people need to be thinking about the lyrics.