What's odd about it is that if something is bad and people do it for pleasure, there's probably going to be less of it than if it's part of what's considered valuable for large institutions.

I think.

Actually, there are examples pointing in both directions. Your example of animals being raped backs my theory-- I don't think there are nearly as many animals being sexually abused by people who like that sort of thing (nor would there be if bestiality were socially accepted) as there are animals being forced into breeding in the food industry.

On the other hand, there are plausibly more dogs forced into fighting because there's money to be made at it than there would be it it were only a private pastime.