Jothar – exactly as everything you quoted says – YU Roshei Yeshiva were against what the event became, and should not have happened as it did. But “support” those people felt was intended to be that people will be sensitive to their issues – never to legitimize practicing any aveiros.
As R Twersky said, the event was a chillul Hashem and showed YU in a negative light because of the way it was interpreted by people who saw what the event as it happened – not b/c all of YU endorsed it. (He was not saying it accurately reflects the YU community) But this again is saying that YU was against it, and in no way shape or form endorses michkav zachar or supports those who have those urges, other than in a counseling context.
Counseling those with issues sounds like a positive thing to me.
And now that you have read everything you posted you should be the first NOT to lump YU all together characterized by that event, since you read about all the aftermath there distancing those events from the rest of YU.
And also, that is quite different than the “mishkav zachor support group” you referred to originally.