Monsters tend to be very good at manipulating people. Psychopaths are very good at telling you what you want to hear. They are very good at control too. Works really well with naive and gullible targets. Once they get said targets in some sort of relationship, they use mental, physical, and even sexual abuse to keep them there.

You mentioned Hitler and his “wife” of ~24 hours Ms. Braun. Remember that for a few years, Hitler was the most powerful man Europe. People are attracted to power. There were other dynamics at play too. Ultimately, she really didn’t have much of a choice in the end game. Notice that Hitler never married her until the very end. What do you think would have happened to her if she had been captured?

Anita is right too that people think they can change their partner. Maybe if I loved him more, he would stop beating me. That sort of stuff. Some folks are attracted to problem people because they see them as projects.