i agree that a parade is not proof they sinned. and the circumstances of Pinchos require to be caught...
HOWEVER there is perspective issue here. why are we jumping on the man who took the law into his own hands??
these people are proudly marching that they do one of the worst sins in the Bible. When Moshiach comes g*y ppl WILL be stoned to death. YOU pray every day that Moshiach comes. so do I.
First off, they'll actually be beheaded, not stoned (non jews are never stoned in jewish law, only beheaded). And the reason people get so upset about this, calling him "a pretend Jew" etc. is because they've been deeply influenced by secular values, specifically the core Western value of "no violence". As a result, when they see the march, which is people actively flouting their disdain for a great sin, one of the only ones that the Torah calls an "abomination", it doesn't mean as much to them, as some guy who goes around stabbing people, who did something stupid, but transgressed no more than a "lo saaseh". He si the guy who's making a chillul Hashem, he's a pretned Jew, not them, because he was violent, and western minds abhor violence. You on the other hand, are approaching it from a Torah perspective, not that this guy is right, but that the marchers are even worse. And you're right-under some circumstances, if this guy was an upstanding yerei shamayim, there may be reason to compare him to Pinchas, though I don't know if the case, nor do I think it was a good thing.