Failing all this I think we really should consider if the overly-strictly interpreted no mindkillers rule that was prevalent as little as a few months ago that much reduced political discourse wasn't a good thing that should be restored.

I used to be excited about the idea of harnessing the high intellectual ability and strong norms of politeness on LW to reach accurate insight about various issues that are otherwise hard to discuss rationally. However, more recently I've become deeply pessimistic about the possibility of having a discussion forum that wouldn't be either severely biased and mind-killed or strictly confined to technical topics in math and hard sciences.

It looks like even if a forum approaches this happy state of affairs, the way old Overcoming Bias and early LessWrong arguably did for some time, this can happen only as a brief and transient phenomenon. (In fact, it isn't hard to identify the forces that inevitably make this situation unstable.) So, while OB ceased to be much of a discussion forum long ago, LW is currently in the final stages of turning into a forum that still has unusual smarts and politeness, but where on any mention of controversial issues, battle lines are immediately drawn and genuine discussion ceases, just like elsewhere. (Even if the outcome may still look very calm and polite by the usual internet standards.)

The trouble is, the only way a "no-mindkillers" rule can improve things is if it's done in an extreme form and with ruthless severity, by reducing the permissible range of topics to strictly technical questions in some areas of math and hard science and consistently banning everything else. The worst possible outcome is to institute a partial "no-mindkillers" rule, which would work under a pretense that rational and unbiased discussion of a broad range of topics outside of math and hard sciences is possible without bringing up any controversial and charged issues, and without giving serious consideration to disreputable and low-status views. This would lead to an entrenched standard of cargo-cult "rationality" that incorporates all the biases, delusions, and taboos of the respectable opinion wholesale, under a pretense of a neutral, pragmatic, and unbiased restriction of irrelevant and distracting controversial topics.

Thus, it seems to me like the only realistic possibilities at this point are: (1) increasing ideological confrontations and mind-killing, (2) enforcement of the above-described cargo-cult rationality standards, and (3) reduction of discussion topics to strictly technical questions, backed by far stricter, MathOverflow-type standards. Neither of these looks like a fulfilment of LW's mission statement, but (2) seems to me like the worst failure scenario from its point of view.