It’s basic biology - pit bulls have a very high level of testosterone and the outrageous amounts of muscle and bite strength/pressure for it to be a huge problem if they attack.

For reference, I believe Jack Russell terriers are the most aggressive and highest testosterone per breed but the difference is you can pretty easily deal with one with one good kick because of how small they are. And if you do get bit, they don’t have the bite strength to cause substantial damage to adults most of the time.

Not surprisingly, in nature this is the case nearly every single instance where the species with the highest level of testosterone are the most aggressive (ex- bull sharks).

And guess what? Dogs aren’t people. Equating it to racism is a real bad argument.