So you link to their "support" of handing out the S.C.U.M. is... I'm not sure, are you saying they should have deleted the comment that seems to be suggesting that the parent is an extremist and so should hand it out? The link really doesn't seem to support your claim that they support this document, quite the opposite in fact.
As for the conference, it seems that someone wanted to give a talk not really related to information security, and the conference organizers asked the Ada Initiative for advice. They suggested that as the subject matter may be problematic for some attendees that they should consider if the material is appropriate for people expecting an information security conference and if there should be warnings. It's an IT conference, and talk about sex and drugs doesn't really fit. The talk was then cancelled by the organizers. I don't see a problem here.