There’s no such thing as a person being a “monster”. People make decisions based on their perception and understanding of the world, which is heavily influenced by their upbringing. If a kid grows up in a household that reinforces negative gender roles, and their schools/community do little to broaden the child’s understanding of gender, it’s going to massively increase their chances of growing up to act abusively or violently toward women.
They are LITERALLY seeing the world differently than you or I.
If you just put them in a box and say “well, they’re monsters… they should just go kill themselves,” you’re merely contributing to the lack of understanding in our country about gender (or criminality, for that matter)—and deterring others from identifying the root of these problems, so we can fix them.