Where I work, and yes I am working now..
At a vet hospital, there is a bulldog/lab I think mix, and a full blood bulldog..
Male and Female the full buldog is male, and he is the sweetest thing, he's calm, yeah he has got a bark, but he hasn't bitten me yet, and I'm the one who yanks him out of his cage, takes him for a walk then shove him back into the cage, Only time he's growled at me was when I stared into his eyes, to gage his reaction, and this was before he knew me..
Outlaw an animal and next thing you know, common house cats must be GPS'd and wear muzzles when outside.
Outlaw the owners, have some people who check up on animals, like social workers, hell it might trim down this kinda stuff, but we all know how the US Adoption program thing is going..
I could show you the meanest 4lb dog in the world where I work, it's not the breed, it's psychological or the owners, or abuse..