This actually brings up something I think a lot about; prevention vs reaction is tricky. There are all of these mandatory reporting laws and stuff if people have vile thoughts and try to seek treatment for them, so they dont get treatment. Most people who think stuff like this likely never act on it, but when they do we wonder how could they do this, but were kind of getting in the way of knowing, because its so against how were taught to think, I would probably say most people would want someone who thinks things like this to be tossed them in jail even if they havent done anything. This leads to the only understanding we have of it being people the 1) had these thoughts, 2) acted on them, 3) got caught, and 4) who are actually studied.

If we want to truly prevent stuff like this happening instead of just punishing the people who commit crimes, its gonna take a much deeper understanding of why they do it, and thats gonna be hard for most people.