It’s the clamp/lock what’s the problem. You can break the clamp by strangling the dog. Take a handle (rake, hoe, etc), slide it under the collar and twist until the dog passes out from lack of breath.
I hate pits, despite their sweetness and loyalty.
PBT need to be ACTIVELY trained to NOT be violent, and the VAST majority of owners do no such thing. Even if that particular PBT doesn't have some of the "bad blood" that still exists in many PBT lines, you simply cant take that chance. In fact, any "dominant breed" dog should be treated the same, just in case. It has to be actively socialized to get along with other people and other animals. Don't rely on NOT training it to be aggressive.
PBT's can be great dogs, if not, they wouldn't have been such a popular breed for so long. But the fact is, the majority of owners don't have a clue, and if they do have one, its how to make the dog even meaner and more dangerous, why else do the Thugs prefer the breed now? That and every other gap toothed redneck.
Ideally, that breed needs to lose its popularity, and the only people to have them would be those who know what the heck they are doing (Ceaser Milan's "Daddy" is an awesome dog!). There are other breeds that if they were as popular, would be as statistically dangerous as PBTs (Chows, Canario's, Giant Schnauzers). Then there are other breeds even more aggressive, which if they were larger, would certainly be as bad statistically if not worse (Dachshunds, Chihuahuas, Jack Russells, most Terriers).