I will not disagree about demons being a danger to humans, and human/demon co-existence being more or less impossible, but I will disagree on calling them evil. My reason is very simple, although perhaps a bit strange at first glance, basically, I don't think demons are evil because they are unable to not perform actions that we perceive as evil. If something can't actually choose between being good or being evil, then I don't think whatever they do is actually evil. Take leeches for example, sure, I don't like them, I don't want to get my blood sucked, I would get rid of them if I found them on or near me, but is a leech evil for trying to suck my blood? I don't think so, I mean, it can't choose anything else, it's gonna see me and its instincts are gonna force it to go try to feed off of me, it can't help it.

That's why I think calling demons "evil" is incorrect.