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Because they understand consent a lot better.

Just like the heretics are usually the most deeply principled.

That tracks here. From later conversations with him, he was not actually a hentai enthusiast nor particularly kinky, but was just sharing it "for teh lulz" - whereas I later ran into another coworker that had expressed concern about his behaviour at a kink club.

(There's so shame attached to being unkinky - nothing wrong with being vanilla! Just presenting this as further evidence supporting your position that enthusiasm for kink is generally positively correlated with responsibility and awareness of how your behaviour affects others)