Although they have a fighting background, PBTs were not bred to kill people (after nearly 2 hundred millenia of domestication--and owning the distinction of the first known animal to bond with man--no breed of dog that I know of has an instinctive nature to kill people). They attack people for 1 of 4 reasons:
1. Some, mainly through bad breeding, are genetically defective and mentally ill (much like the human psychopath that comes from an otherwise good home). 2. They are abused and cruely treated by their owners. 3. They are neglected, unsocialized and untrained by irresponsible people who should never own them...or, 4. (the main reason) they are trained and encouraged to use their aggresive nature to attack (which is the same in my book as reason no 2).
I believe that people who are not responsible for proper socialization and training should NOT own a PBT just as I do not believe that everyone who does not take firearm training should own a firearm--there are obvious safety issues involved. But let those of us who know how to handle both alone.
Generations of breeding....to kill. It will take generations of breeding to reverse this bred in instinct.
If you really believe that kindness, proper training and handling will wipe out generations of killer inbreeding ... you are mistaken.
It is your choice to have these dogs but generations of genetic altering will not be removed because you are a nice guy.