ISLA.
I don't think his message was wrong; I just don't agree with how it was presented. You are dangerous, but so is anyone else that comes through the portal. I mean, we all have light and darkness inside of us. There's nothing wrong with having those sides; it helps keep us balanced.
What matters is that you learn something from it. It's hard. The fight or flight instinct leans stronger towards fight for werewolves. You were attacked and your work was damaged. That's enough to make anyone snap.