Hair is the one aspect of our self-image that we can most easily influence. It has a lot of "youth" and "vitality" in its payload and hair grooming carries a lot of the conformity signals within society. That's one reason why the Abrahamic religions tend to have assorted taboos against cutting hair - it's a vanity cue and by leaving hair in its natural state (or protected from the world under a turban etc) one is showing austerity for God.

With social baggage like that, the act of attacking one's hair is justifiably seen as a socially-deviant act, just like vandalizing empty buildings. Worthy of note - you didn't go to a salon and say "I'm thinking of going shaven; make me look good" you went to your Crowlian friends 'cuz they had clippers.

Worthy of note - I had friends that would shave their heads before they opened for a big headliner. But they were in industrial bands. Not very good industrial bands. And in that crowd, walking around in a G-string with electrical tape over your nipples was considered normal, so the context needs to be considered.