I need to inhale to breathe. If I'm addicted to a substance, I need it like the air I breathe. Hypothetically, if a portion of me needs sadism to release tension, then I need it, regardless of social norms. Banning it doesn't remove my need for it, but it might change shape. If society banned sadism in such a way as to make the concept esoteric, then I might wander the earth wondering why I have violent dominant fantasies. It doesn't remove the desire, it removes the definition, is my point.
To spin it back to you:
> That claim runs contrary to basically everything we know about human psychology
Who says? I'd like source(s).