I wouldn't harm one. Just can't think of a good use for them and hate the smell/filth.
When I was in highschool, I had an acquaintance whose family bred cats for a living, ...in her house.
The first time I went over to her house, ...she warned me. She said that other people told her that her house smelled. She didn't notice it, ...but that's what others told her. I thought 'ok, thanks for the warning. how bad could it be?' I thought a smell like maybe cooking odours or something... curry, garlic, tobacco or pipe smoke, ...but I was soooo not prepared for what I encountered. There was no bloody oxygen in the place. Literally, there were so many animals... they sucked all the oxygen out of the air. My lungs literally fought for every cm
2 of oxygen they inhaled. The scary part is after about an hour or so, ...I was beginning to get used to it. When I stepped outside the house and my lungs filled with oxygen with such ease, it was amazing, ...I felt a gadzillion times better. It was there that I saw my first fur ball. I was shell shocked. It was also the last time I went to her house ever again. Nice girl, ...but her company was best enjoyed at school.