I'm a vegetarian, but still, I can't see how it's sadism to cut meat off of the head of a DEAD pig. If the pig was still alive and fully conscious, yes(and I suspect the pig would do some sadistic things to you if you tried it). But if Porky has already slipped this mortal coil, cutting meat off his head is no more sadistic than performing an autopsy is being sadistic to the corpse you're performing it on.

(P.S. My apologies to anyone who never wanted to see the words "autopsy" and "meat" used in the same sentence.)

(P.P.S.-you should only be performing autopsies if you're actually a trained medical examiner or coroner. Hobbyists are strongly discouraged in most countries).