>>45782906>EvilThat's a rather gross exaggeration.
Hatterenes aren't evil, it's that in wild ones strong emotions causes severe distress and they don't know how to handle it aside from silencing the source of it. In a tamed one with a good trainer, though, they can learn to overcome this and thus strong emotions or loud noises become more of annoyances than murder-inducing-rage-headaches.