These laws need to be enforced and when people continue to breed these types of dogs they should be fined and the dogs should be confiscated and given to rescues who can evaluate their temperaments to see if they are adoptable otherwise they should be put down. They are akin to a loaded weapon.

Although there are some responsible owners, not all the owners of these aggressive dogs are responsible and therefore they are dangerous to society at large. Basically, grandfather in all the existing aggressive dogs, but outlaw breeding, and require muzzling when out and about.