Yeah. There are a number of meta-level concerns here that complicate the problem, but at the object level the difficulty is that our present attitude towards politics creates an unstable equilibrium: there are politically charged topics that can and should be discussed with the LW toolkit, but there's a pretty strong tendency to go beyond those tools and into unproductive sparring, and no good way to stop it.

I'm for the mind-killer meme insofar as it provides a way to put on the brakes before discussion gets to that point. But I don't think it's actually very good at that, especially since there's the potential for it to be used as a bludgeon against political viewpoints individual posters don't agree with (those they do, of course, register as common sense rather than ideology). Banning politics altogether is one way to deal with this, hence the norm creep; and it really does need to be dealt with. But I'd like to see a better approach.