I think that entertainers should be free to comment (or perform) about any topic that they care about - First Amendment, and all that. The audience is free to choose whether to listen or not.

And anyway, why criticise performers for mixing politics and entertainment? Politicians have done the same for years, to the detriment of political discourse.

Mind you, I wish I could recall the name of the cynic who suggested that the first ever protest song was a CIA conspiracy.

:^)