Is it possible for someone to delete Richard Karpinski's comments on the meetup page? If I didn't know this group and I saw a member endorsing AIDS-denialism I would dismiss them as crackpots.
Of course, if you click on his profile you see that is his goal.
"No one should join this group or come to these meetings. If they do, their ideas will be attacked and they will be overwhelmed by adverse reaction from dozens of people who think nothing of making people change their minds about their most cherished beliefs."
Yes, I expect you guys would be a little mean if a real-live HIV denier showed up at a meet-up.
Robin Hanson and possibly Michael Vassar will be present.