What would you think of the following solution?

Announce 'I would like to have conversations about the controversial topic Pick-up Artistry. Because talking about it publicly can result in problems, If you want to talk with me about that topic, please send me a message stating your position on the topic.'

By keeping it open like that and not stating your own position, it seems to be about as not prone to mindkill as you could get.

The downside is, private conversations don't have as much bounce effects. For instance in the prior mentioned thread, Viliam_Bur essentially created a post which I don't think would ever get paralleled in a series of private conversations.

(Viliam_Bur's post for reference: http://lesswrong.com/r/discussion/lw/klx/ethics_in_a_feedback_loop_a_parable/b5oz