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While i'm sorry to hear about your story and hope your sister and her dog are doing ok, the basic point is being missed. The OWNERS responsibility is to control his/her dog. I was walking my dog last summer. She is a staffordshire terrier mix and has never bitten any dog or person. She was attacked and bitten in the head by a large mixed breed (german shepherd)that was off leash while I was walking my dog leashed. The owner admitted he knew his dog was agressive but had it off leash in a public park anyway.
Irresponsible owners should be held accountable for their dogs behaviour not the other way around! Ban "pit bulls" and these people who should probably not be allowed to own a rat let alone a dog will simply choose another breed. Seems to me it wasn't that long ago there was talk about banning rottweillers and dobermans after some media created misinformation surfaced about those breeds too.
To quote a phrase promoted by the people at "hug-a-bull"; BAN THE DEED NOT THE BREED".