Well, if you ENJOY beating people, does that not make you abusive? What if said person could NOT find a partner to go along? Would they just remove it from their repertoire? I think not.
If you enjoy inflicting pain on others- (physical and/ or psychological) - that makes you sadistic... like me. There are plenty of sadistic people in the BDSM scene (mostly women) who enjoy dominating and inflicting pain on the masochists who enjoy it (mostly men)
BDSM helps us channel that energy into something consensual, legal (for the most part lol) and exciting. Both the sadist and the masochist play off each other's pleasures, desires, and fantasies to achieve mind blowing experiences in the dungeon, the bedroom or otherwise