Not too off topic, in my opinion, since most beliefs recognize both angels and demons – and the most important difference is in their intentions.
So I seriously believe sometimes we are assisted by beings we call angels, while destructive people are assisted by beings we call demons. Names don't matter, we could call them givers and takers or apples and pears, what matters is the intention. Visible from the outcomes of one's actions if not right away.
Again, it’s all clear for religious people, namely Christians, the Devil is real and seductive.
But a lot of non-religious people will agree too that “evil” can be very attractive, superficially.
Psychopaths like Bundy are believed to lack empathy, but they can imitate normal emotions and appear even more sane than someone truly sane who doesn’t put so much effort in responding properly – and that’s precisely why “perfect” people make me cautious.
Of course, I’m not talking about sane people with good self-control, I’m talking about people who respond perfectly but all your senses are screaming “fake”... it’s hard to describe, but most of us can spot a psycho if we listen to our instincts. Seriously.
Maybe it’s just our ability to “measure” the sincerity of someone’s tone and body language, maybe it’s our angel whispering to us the warning about the demon that follows various Bundies, or inhabits their bodies.
According to my experience, very bad people often have inexplicable luck. One of those two guys I’ve met and had the impression there’s something seriously dangerously wrong with them, he survived few accidents that would kill any normal human.
So I don’t believe in coincidences. There was the reason why he was saved to do more harm and there was the reason why I was saved to do more good – I hope, I’d hate to die one day and find out I was saved because my purpose was to screw things up
At least I wouldn't ever do harm intentionally, and that, the intentional harm and destruction is what I see as "demonic". It's very hard to explain destructive intentions with no spiritual element involved, in my opinion, since even low intelligence should be enough to make anyone constructive out of simple common sense if not out of empathy.