But you should care, because it does matter, and that's what you seem to be missing. You're allowed to be upset, no one is saying you aren't, but you're upset with someone else. There has to be a distinction between future crimes and present people, and if there's not, then there is no point to this place. At all. And I simply refuse that to be the case.
Also, I don't know if you realized, but there is no DMLE here. And here, Fenrir Greyback has done nothing to warrant your words. And you're right, that compulsion doesn't come out of no where. It comes out of people calling you a monster continually, when you fight to be something else. Someone showing you disdain, when all you want is some iota of acceptance. Someone pigeon holing you into a category and treating you like absolute scum until you develop a disdain for those very people. Sometimes, monsters aren't born, they're made by the circumstances which they exist in.
Also, rehabilitation isn't something that is a foreign concept or completely out of the realm of possibility here, or even back in the real world. Some people can change, some people can realize the error of their ways. Until he proves to be the opposite, I will continue to support him.