I think that a discussion in which only most people are mindkilled can still be a fairly productive one on these questions in the LW format. LW is actually one of the few places where you would get some people who aren't mindkilled, so I think it is actually good that it achieves this much.

Unfortunately the non mindkilled people would also have to be comfortable simply ignoring all the mindkilled people so that they can talk among themselves and build the conversation toward improved understanding. That isn't something I see often. More often the efforts of the sane people are squandered trying to beat back the tide of crazy.