Veganism

[Thumpalumpacus]

-and, like before, I'd just give you a picture of a broken face.  

Pyschological and physical damage are real, and scientific.  We could expand our inquiry by looking at the consequences of an so's face splitting permissive societal structure, historically.  We've been there and done it, after all.  Also real and scientific.

This too is an appeal to subjective effects of doing something I personally consider evil, yet other people don't always suffer these negative effects nor hold my constraints. Indeed some delight in them. Those prisoners didn't spring up out of the ground.

You're appealing to results while you're arguing that morality is a priori objective.