I used to work with a guy a few years back who used to take great delight in getting people fired

I could never understand it and it used to concern me so much that if someone did get fired I wouldn't let him know because I couldn't stand seeing his face light up
It was people who he used to talk to as well
He didn't discriminate
he was like some kind of smiling assassin
In the end I had to stop speaking to him completely because he was actually dangerous
I think some people are just born this way
I didn't and I don't even hate him for the way he is/was but I just can't have people like that in my life
It's like bad energy
This character you describe sounds particularly sinister.