I'm not so much against the punishment of hurting others, but I am against the 'allowing yourself to be injured' punishment.
[It'd probably be dicey to be honest. The punishments only go into effect if you need medical treatment, but someone severely injured would probably be punished regardless due to life sign monitoring. Buffy hasn't tested that idea. She'd be more than willing to beat Spike to the point of near death though in the name of science.]