Shelters have no shame lying their asses off to people about the presumed breeds of their dogs. Austin Pets Alive is often sitting at 90%+ pit mixes, but it's rare to find even one listed that way. I love dogs, but I don't support our no-kill policy. It just floods neighborhoods with bad dogs. We have a neighbor who adopted a pit mix (she was told boxer I believe) who broke free from his leash and attacked our dog (on leash). They wouldn't get rid of it after that incident, even after the city came out for a hand slap. Then it attacked one of their kids. Gone now.
As a breed pits can be just fine when raised from birth by responsible people. The sheer volume of pits in shelters who come from miserable backgrounds and irresponsible jackass humans is at the root of the problem, IMO. I'm not necessarily advocating for putting down every pit mix that lands in a shelter, but I'm open to that discussion. Perhaps not breed-specific rules, but a checklist of traits and history that fast-track certain dogs for termination would be the way to go.