Dogs can be (and some are) bred to promote aggressive tendencies. Let’s not forget that many cute white fluffies were originally bred as ratters and with irresponsible breeding some of those aggressive tendencies can re-emerge. Failure to properly socialise and train dogs can also reinforce these negative tendencies. Unfortunately, what most responsible owners don’t want to acknowledge, is that there are far too many morons out there who actively seek dangerous and aggressive dogs. Just do a Google search and you will find plenty of nuts asking questions like “I want to get a dog that will rip the nuts of anyone that comes through my front door, and won’t be put down by a few gunshots, should I get a pit-bull or a Rottweiler or what?”
As usual it is these jerks and their dogs that give the breed a bad name.
The difference I suppose is this:
If an irresponsible owner buys a “white fluffy” from a bad BYB, and doesn’t train and socialise the dog properly, they may end up with a psychotic little nutter that will bite someone, and which they will end up dumping at the pound.
If an irresponsible owner buys a “pit bull” from a bad BYB, and doesn’t train and socialise the dog properly, they may end up with a psychotic nutter that will savage someone, possibly fatally.
So the solution to your problem is to ban every dog over about 10kg right? Because any dog over 10kg that hasn't been trained or socialised properly has the potential to savage someone, possibly fatally.
The other point you are forgetting is that banning breeds doesn't eliminate them, it creates a DEMAND on the black market for that specific demographic you mention, making the problem much worse. Anecdotally it seems that in NSW there are more pit bull type dogs around now than there were prior to the legislation coming in, and certainly pups of unknown heritage are fetching $1000+ when prior to the legislation they would have been worth a few hundred bucks at most.
Yes Banning doesn't eliminate them. Has the demand gone up? I think the hype around has died down in recent years. I think actually responsible pet owners and working dog breeders are associating less with the breed due to the liabilities of owning the breed and the amount of w@nkers the breed attracts.