I think the point of the Milgram experiment was that you could pressure ordinary people to go too far, not that there is a 1-5% population of "psychopaths"

https://www.frontiersin.org/journals/psychology/articles/10....

what I find interesting though is that Freud's (non-Freudian) interpretation of sadism seems obscure in the west although it is definitely part of the schema of Japanese pornography. [1] That is, the sadist feels that they an agent of justice (will write 正 on the body of the victim) whether the victim's sin is something most people would recognize as sinful such as "being an email spammer" or "getting drunk at a party and acting like a boor" or something most would be puzzled by such as "dressing like a dork" or "being naive" or something marginal like "gave a lecture about a topic they didn't understand." Whatever it is, the sadist feels like the victim deserved the treatment they got.

[1] Freud, like French Theory, is "big in Japan"