Yeah, I know what you mean. It is hard to understand how some people can be like that.
Sometimes I can spot those people quickly and easily. Sometimes the eyes give those people away. It kind of looks like they have an empty dull look or what I call "dead eyes".
And sometimes like you said it takes a while to identify folks like that. They can be pretty manipulative and even try to make you feel like you are the one with the problem. Even though, chaos seems to follow them around like a plague. Any time there is trouble or drama, they are in the midst of it. They like to start trouble and chaos, and then when everyone else is upset...they just sit back and enjoy it.
Thats definitely sounds like the enemy at work and the nature of the beast,,,i have had many many temptations over the years and that's the thing that the devil our adversary likes to do which is to tempt people with all sorts of things all day as well,, as in the bible it says that the devil has come to accuse Gods children day and night... so in my book of working the devil out the only way he can accuse you day and night is to get you to fall for one of his billions of tricks of temptations then put you down for it, and they even do this whilst possessing a person and even after getting you drunk on beer before hand... he loves persecution of your own conscience,,
It is our conscience that is so fragile.... many times i have fell for temptations only to then be persecuted by devils demons after i have slipped up,, The devil is also good at appealing to your conscience to say your going good one minute only to say your doing bad the next.. Or vice versa appeal to your conscience to say someone is bad when you know what's Good etc... every time you can bet your bottom dollar the devil has made that bad thing happen. Then he sits there and enjoys the division between people,, my guess is the sadistic nature of devils are they want to make you mess up only to then condemn you,, because of their own pride..they want to torture people for all eternity their hatred is that bad. They even want to torture you for doing good. The hatred of devils towards human beings is that they want to torture you for all eternity before you have even done anything wrong by playing God and have a plan to do so..
Greater is the light that lives in you providing we keep our house in order tho. As a house can not stand on sand, it has to be a solid foundation. Otherwise, we fall. And then when where down we get kicked by this enemy of ours, so we must be prepared,,