Because meat is evil, and stuff.

The only direct encounter I've ever had with a militant animal rights activist group (it probably was, but I don't remember if it was PETA) was when the released all the mink from a mink farm near where I lived. Guess what happened? The little animals did not run free and live long happy lives. They ran across the highway that was 100 feet away and died in droves. The rest probably became meals for local predators. Regardless, to this day, there are no wild mink near where I live.

Not impressed.