Erik wouldn't hurt someone unless he had good reason to. [He really does believe that, no matter how badly things had fallen apart. And while admittedly, Erik's definition of 'good reason' might be wildly different from his own, it would at least be more logical than stabbing people to death in a hallway because he could. It wasn't like Blake had his ability to wield a weapon taken away from him after that.]

If he did, I'd make sure his warden understands what happened before jumping to conclusions, and I still don't think I'd advocate removing his abilities. He's getting worse without them, and it's just proving that he can't trust humans to understand and accept us as equals.