The only pits I've seen with "bad behavior" or "aggressive tendencies" were raised by people who wanted them to be that way.
I grew up on a farm where my grandparents ran a boarding kennel they launched in the late 60's after military retirement. I saw
every breed under the sun from the time I was born until way into my 20's when I moved from my hometown.
I've never seen a breed that is purely sweet if the owner is the opposite, any individual dog can be made into something you won't
want your fingers or body parts near if you treat it poorly, just like people, you can raise good ones or bad ones but you are the factor
that controls are large part of the outcome (yes genetics and line can add traits but you are the primary imho).
Do I get a knee jerk reaction to certain breeds based on some bad experiences, yup sure do, but they generally again accompanied
bad people...
Only dog that ever actually bit me in dealing with thousands a year through the boarding and those my family owned was a "scotty"
that my cousins owned, dog was taunted and played with rough from the time he was a puppy, the other litter mates were with some
family as well and were as sweet as can be, not "bear" little bugger would do anything to get a piece of flesh from you!
I think Pits are having a turn in their future with so many shows, groups and others pushing what they are and what they aren't. I have
good friends that are quiet hippy tree huggers who have adopted pits from shelters and they are amazing dogs!
The other aspect we all know is that while some dogs (breed or individual) will tolerate just about anything a kid or child does, letting a dog
stare at or harass a dog is a sure way to get any of them to turn into biters!
Anyway, interesting off topic here, truly love dogs haven't been without one in my home till we lost the last two we had. Frankly would rather
spend time with dogs then most people!

Pits and other so called "aggressive" breeds need the rehabilitation of their image in society. It has been earned through the actions of people,
not the breeds themselves.