You use their beliefs against them. That's the beauty of my solution.
Trans people think they are marginalized and people hate them enough to kill them? Ok, let's show that to a teen who wants to troon out and see if he would continue with the trooning after a beating only stemmed from him wanting to troon.
Trans are really lazy, morally corrupt and crave positive attention. They won't do anything besides complaining on twitter or do some half ass manifestation just for asspats.
I don't care about the trans community, I care about that teen that with a proper beating can literally understand the severity of what he wants for his life. It's alse serves a message for any would be troon knowing there are actual, factual and contemporary situations where they could be put in actual danger if they continue that route.
Spare the rod, spoil the child.