If we're going to disagree with people just so we don't "legitimize" their other views, even if the thing we agree on is true and important, we're basically screwed as a society.
I think a lot of people, and especially ones his age, have invested a lot of their identity in being rebel progressives. They don't actually avoid conservative ideas because they think they're wrong, it's because they would be embarrassed. It's lame.
I also think that this attitude, which is shockingly common among progressives, shows that they are in reality very unsure of their own positions.
The fact is, if I am watching something by some person or group I don't share much political ground with normally, or get to know some of those people, it is possible I will stop and think, maybe these guys are wrong about a lot, but they are not actually acting out of selfish motives, evil. Maybe they aren't entirely motivated by sexism or racism or whatever it is I've told myself before.
They may have reasons beyond that for their views. Maybe I'll wonder what they are, that they have come to such a differernt conclusion than me and look into it.
I think Billy Bragg and his type are totally terrified of people doing that. I have to ask, why? Why don't they have any confidence in their own positions and arguments?