Presumably you consider every more-or-less-polite forum on sex/gender issues to be mind-killed too, then? The fact that people tend to get incensed about, strongly condemn and downvote things that they deem to be politically extremist/misanthropic/misogynistic... is it really the standard by which to judge mind-killedness? Or should we rather look at the quality of empirical and moral arguments used in the discussion, without showing undue tolerance to attacks on the Enlightenment values that LW's mission implicitly includes?

Would you show the same tolerance to overt racism and political extremism in a thread on group differences in intelligence? In my opinion, LW handles that controversy admirably, and has never let the moral issues inherent in it out of the discussion.