Whatever, everyone's got their preconceptions.
I got my preconception from a vet who said to me, 'Since you have small children, and you like medium to large dogs, you should look at breeds like golden retrievers, labs, or cocker spaniels and avoid breeds like chows....and I can't remember the others he said.. because I knew I liked retrievers and labs so I listened more to what he said to get instead of what he said not to get.
And he was talking about innate or inbred temperament and which dogs were safest to have around small children.
I was asking a question. I'm not pro legislating against or mistreatment or cruelty toward any breed.
Although I am instinctively afraid of sharpeis now - since one reached out and bit my two year old daughter in the face for offering it a treat. I would also never have another german shepherd - too protective of one person (me) in a home where other people lived. Everytime someone touched me - and I'm talking about a hug - that dog was coiled and ready to spring. (I took her as a puppy from someone who'd had a litter and needed to move somewhere they couldn't have a dog).
I think there are innate differences in temperament that make certain dogsm more inherently dangerous in certain situations. As long as the owner is aware of this (as I had to become aware of what to do to keep the kids around my german shepherd safe) it's not a problem in other words -if you live alone and you don't have kids and you keep access to people at a safe minimum - you're covering your bases.