I don't actually care about the Mikaelsons one way or the other, but I'm sort of chiming in on what some of the others have said about anyone can be dangerous.
Single worst person I ever met was a insane genius, who figured out how to manipulate anomalies in time in order to get back to the very dawn of humankind, in order to wipe them out before they could start. She was human. And yes, utterly insane, but still, human and still smart enough to do that, came within inches of doing it.
And then she was eaten by a velociraptor. And much celebrating happened that day.