The breed is flawed and they are dangerous. We have seen this time and time again.
The breed is not flawed. They tend to do exactly what they were bred to do.
Just about anyone will admit that border collies are compulsive herders, and that retrievers are compulsive about chasing things and bringing them back.
But for some reason there are people who refuse to admit that some breeds of dogs were intentionally bred to be violently aggressive, and that this breeding was successful at instilling a very strong tendency towards the desired behavior.
Now it is obviously possible to keep the desired physical form and breed out the aggression, just as it would be possible to breed a line of border collies that didn’t try to herd things.