How different is he from you? His sacred cows are threatened by human sexuality and the notion it is evil. Your sacred cows are threatened by the injustice caused by mentally ill people. My sacred cows are threatened by vigilantism but it is because I have so much suppressed hate I want to kill everybody. Fortunately, for you of course, that strikes me as a very bad idea and just the result of an obsessive need to be right. Perhaps you and I should relax and let folk not so easily triggered figure out how best this nut case should be handled.
We can't just let folk go around beating or recommending somebody else beat the shit out of people willy-nilly.
Scientists have done experiments on this trying to gauge how much pressure people can take before they crack and explode in violent rage, but being ethical and humane have had to experiment on animals as cognates.
In one experiment they put a cork in a pig's ass and fed it normally to see what would happen. Unfortunately a monkey got lose in the lab and there was a huge explosion. Nobody knew what happened but one scientist reported the last thing he saw was the monkey trying to put the cork back in the pig's ass.
Please don't monkey around with vigilantism.