Your post is pretty much what I think about pit bulls.
Another thing I would like to mention is that it's almost always very bad for a breed when a particular kind of dog becomes popular. Then everybody wants one but they don't want to do the research on the breed, wait maybe a year or more for a puppy, invest lots of time and education to learn how to choose, train and handle it, and pay a lot of money for a really great quality animal from a expert breeder who really cares about the breed and great temperament.
No, they see a movie or see some movie star or other celebrity with a particular breed and they want one NOW.
This happened with dalmatians when the Disney movie came out a while ago. The only dog that has ever been agressive to me and actually bit me was a dalmatian that was cooped up in a house all day.
When I was growing up, the number one purebred dog for dogbites were toy poodles, I think followed by cocker spaniels and doberman pinschers.
So, I do think that breeding is a problem, but so is the impulse purchase of pets for the reasons of trend or style. It's also the poor breeding practices of amateur breeders who are simply taking advantage of a money-making opportunity and have no clue what they are doing.