I'm looking for a word in English for someone who deliberately sets out to disrupt relationships with genuinely evil intent. Something like a cross between the Childcatcher in Chitty-Chitty-Bang-Bang and a ghoulish kind of pervert who loves to threaten people with relational chaos, like the scammers who send the "I've inserted spyware on your computer and filmed you pleasuring yourself while consuming porn, now pay me or your family and friends see the video" email, only several orders of magnitude worse. "Troublemaker" just seems too benign for this sort of person. Even "malicious" and "sadistic" don't seem sufficient for the kind of person I'm thinking of. I'm thinking, really twisted, the kind of person who would threaten parents with the idea he might both abuse their children and gaslight them into thinking the parents were the abusive ones. And if the words are gendered, I'd like them to be referencing the masculine.
Something like this:
"Misandros was not just vile and malignant; he revelled in the anguish he caused to his victims, not through physical abuse, but through playing on their thoughts and emotions as the sound of fingernails dragging down a blackboard plays on the ears of a sensitive person. He seemed to hate anyone who had good relationships and wanted to destroy both the relationships and the people involved. In short, he was a [word I'm seeking]."
Any good candidate words you can think of? Thanks.