I don't have terribly much of a problem with other people feeding live pinks, if that's their vice of choice
I myself tried it once because I had a non-feeding snake, but neither the non-feeder, nor most of my other snakes were interested in their food being that fresh, so I was stuck with a handful of little rodents I had no accommodations for and who were complaining vociferously - it was awful
fortunately, the one snake who was willing to eat them, was hungry enough to eat them all
I wouldn't put the feeding of live prey quite in the same category as dog-fighting, and yet I do believe it to be a spectator thing, rather than anything that benefits the snake