The issue for many is more of a human rights issue. For some, the answer is that the Torah forbids, and these people must suffer discrimination, or worse. Some people are not comfortable with this Mehalach. They don’t see why there is some kind of emphasis about this Averia over many others, including financial crimes, sex abuse, Chilull Shabbos and others. Why this dafka causes more extreme reaction than to other aveiros which are done. THis I think is the main divide on this issue. I personally am schizophrenic on the issue, I would say I am teiku. As Frum person, I cannot accept that whole gay experience as valid in any way, but as person who has lived in this world, I see the point about over zealousness on this averia over so many others. It seems unfair, without justification.
It would be an interesting question if I was invited say to such a wedding, say a relative.