It looks gross and that upsets people.

Factory farming is absolutely horrific but most of the same people appalled by this still eat meat. Pigs and cows are very smart (pigs may be smarter than dolphins) but we don't seem to mind farming them because the squalor and suffering is out of sight. Whales and dolphins that live better lives being hunted seems awful because we can see it.

This is the same thing my father did with my sister and I. I had heard all of the Hobbit and the Lord of the Rings before I started kindergarten. The rather southern teacher was terribly offended that I had been read such things.