You have it wrong!

If a performer introduces their music with a political manefesto, political speech, at a music event then that is inappropriate.

If they sing as song with political content and without asking for support for the cause simply explains the context that is fine.

If a song has political content that is fine

If a performer has a political adjenda but does not inflict it on a crowd there primairly for music that is good too.

If I go to a music event I feel that appart from song content which can be of any political persuasion I do not want to have it turn out to be a platform to push a political line.

There is a difference.

I have been to some performances where it took ten minutes to sit through a political manefesto before and inbetween each song. The ones when they tell you to support xyz politico or xyz cause.

Songs can be about anything and are good no matter what they have in the lyrics.

They then are in the realm of art

Now if the performer goes to a political rally they can spout their politics and sing their songs as well.

Conrad