I agree that there, sadly, probably is not a home for every homeless Pit Bull in this country. There's not a home for every homeless dog of any breed.
I do not agree with a truly "no kill" (no euthanasia under any circumstances) policy. The shelter I volunteer for tries not to euthanize healthy dogs, but dogs that have been in the shelter for months on end have often developed behavioral problems that further prevent them from being adopted by the average family. These problems get worse the longer dogs stay in the shelter. It's a vicious cycle and in the end, the dog loses.
When I pulled Zaphod out, he was really close to being PTS. He was losing weight dramatically and wasn't healthy, but he was/is also a behavioral and emotional wreck. He is still unable to handle living inside my house. Nobody would have adopted a dog like that (hell, I have second thoughts sometimes) so would it truly have been fair to Zaphod to make him sit in that cage for another year, two, three before he finally bit somebody, killed another dog/cat due to frustration, or escaped to his death?
Though Zaphod is getting some training and I now consider him borderline adoptable, what if he had been adopted when he wasn't adoptable because the shelter guilt-tripped someone into taking him? You know, the whole "his time is running out, all he needs is a family, etc." thing. Works for very gentle, sweet, soft dogs but not for dogs like my Z. He's not an easy keeper, he's too aggressive for most people to handle, he's too strong for most small people, too boisterous for kids under 12, too protective for people with a very active social life... Really, think about it. What home would that dog fit into, untrained as he was? He certainly didn't (and doesn't yet, though he's getting better) fit into mine. He can't stand being in the house, for one. That in itself would've caused the poor guy to be returned to a shelter... Or maybe put in a backyard, with nothing to do except relish the fact that he has his own territory, and grow increasingly more protective until someone winds up getting bit because they walked into or near his territory...
I truly do think some dogs are better off dead than in the wrong hands.