[Dirk wasn't even kidding about the murderers thing.]
That's a terribly extreme measure! No matter how awful he is, that doesn't mean he deserves to die.
He's my responsibility, and as such, I'm doing everything I can to help him grow as a person. Part of my responsibility is making sure no one else gets hurt.
Besides, he was especially irate yesterday. He may be a fair amount easier to deal with once he calms down.