Recently my housemate was annoyed at me. I'd been a stickler (a real asshole) about our house rules, and she was irritated at me for bothering her to comply. She's emotional enough that she'll stop saying hello and goodbye to you if she gets bothered at you. That sort of thing really rubs me the wrong way; even if I hate someone, it never is OK to be rude.
After a few weeks of her not greeting me, I noticed myself daydreaming about getting her illegal boyfriend deported. I was excited at the thought of retaliating. Given my previous experience reporting people, I figured I might have to lie in order to get them to take action, and I tried to think of what might work.
Normal people would think this is extreme, particularly given that I live with the guy and I like him. At times I pity him for having the awful girlfriend that he does, being stupid and having a difficult lot in life. But when I get angry enough at his girlfriend, it is easy for me to rationalize wrecking his life and really enjoying it. I can easily anticipate the thrill I'd feel at seeing it happen. Normal people would call this "evil": premeditated harming of other people, for my own selfish reasons.
I think this illustrates a key difference between me and others: I'm polite and rule-oriented, but potentially vicious, in a cold and instrumental way.
I've attempted to use the authorities to hurt people before. Once I was dating a former professor of mine (10 years older than me) going through a divorce. One day I woke up in her bed to hear her husband kicking my car and yelling. As I saw it, I was having sex with his wife, in her (formerly "their") house - 100% legal. Him creating a disturbance, trespassing on her property and kicking my car was 100% illegal. Had I had a gun, I might have easily killed him and tried to claim self-defense. We called the police. I explained to the cops that I wanted them to throw the book at him.
The cops explained to me that the criminal case probably wouldn't go anywhere, because of the extenuating circumstances: guy going through a divorce, another man in his bed having sex with his still legal wife. Of course I could pursue a civil action if I wanted, but that maybe the best thing was to just avoid antagonizing a guy going through the most difficult phase of his life. A few days later I called the INS (it was INS back then, not ICE) and tried to get the guy deported. They didn't do anything, which incensed me, because I had to reckon with the possibility of a potentially lethal confrontation with the guy.
Final anecdote: when my ex wife and I used to go on walks, she'd carry a gun. We'd had trouble with dirtbags and irresponsible dog owners in our area, so we figured we needed lethal force. We discussed it and concluded that if anything happened, it was crucial that she be the shooter, because as a pretty woman, she would certainly get off. So she carried the gun, and it was her job to shoot anyone or anything that needed killing. We talked about it like it was a math problem.