thundara has made an excellent point about perspectives. That's really how things like this should be thought of. I spent half the summer considering similar problems like Savior Children (Born to donate organs/tissue to sick siblings), Black Market Organ trades, and all sorts of similar issues. As much as some perspectives may cause uproar or personal disgust, they are objectively no different from any others.(Usually) By my estimation, there is no number of cats worth the life of a person dear to me. I would beg and plead for alternatives, I would offer myself before I would offer any other organism if such a thing were possible. It is not an easy decision, but a choice. I choose the health and safety of those I love over quite a lot else.