No they shouldn't. In the end, it isn't the breed that matters. It is about whether or not the owner had properly socialized the dog when it was a puppy. Rescues and strays are a loving wild card and should only be trusted after SEVERAL months of constant attention, and even then like any other dog there is a chance there could be a trigger to push the rescue into an aggressive state. However, if the dog was properly socialized and trained it is no more likely to bite somebody than any other breed.
I mean did you know Pitbulls aren't even in the top ten most aggressive breeds? Believe it or not, Chihuahua's are actually the number one most aggressive breed followed by Dachshund's. And please don't mistake aggressive with dangerous, otherwise you're going to make yourself look handicapped and shallow. Just because it's aggressive doesn't necessarily make it dangerous, and just because the breed is dangerous doesn't mean it's naturally aggressive.
Cats attack children just as much as dogs do, but it's not paid any attention to because "cats are just so cute and even though you're loving bleeding, he's just being playful". The only reason there seems to be so many Pitbull attacks is because that's what people bandwagon about. If you ban an entire breed because of isolated cases that account for maybe 2% of all owned and alive Pitbulls you might as well ban German Shepherd, Rottweilers, Alaskan Malamutes, Chow Chows, Huskies and all the other dog breeds in the world because someone once got attacked by one.