Ok sure I can agree with this, even if I think Overcoming Bias/LessWrong used to be more interesting when we stuck to EY's proposed norm. But come now you must know of what I'm talking about when I say:
It has now been applied to everything from biology, sociology, sexuality and even recently to religion.
There has been overreach. Worse politics as the mindkiller is now being used as a political tool.
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...
The last point reminded me of speculation from the recent LessWrong article Conspiracy Theories as Agency Fictions:
Before thinking about these points and debating them I strongly recommend you read the full article.