Here is some history on the Pit Bull and an excerpt from the web site.
ASPCA | Pit Bull Cruelty Pit Bulls are descendants of the original English bull-baiting dog—a dog that was bred to bite and hold bulls, bears and other large animals around the face and head. "Bulldogs" were bred to hang on without releasing their grip, until the animal was exhausted from fighting and from loss of blood. When baiting large animals was banned in the 1800s, people then started to fight their dogs against each other instead.
This is probably the reason you will often hear an owner after an attack say they tried to do their best to get their dog to let go, but the dog would just not.
If humans turned pit bulls into an aggressive dog with a jaw clenching bite, it was done 100's of years ago, just like yorkies were initially bred as ratters, and most still have that tendency today, the pit bulls were as it says in the article bred to bite and hold, and this was back before the 1800's. Of course I know there are other mean dogs and occasionally a dog might attack that is mistaken for a pitball, but the overwhelming statistics prove that pitbulls make up for a much higher percentage of serious dog bites and dog bite deaths.
Perhaps hate really is to strong of a word, because I really don't hate anything living, regardless if it is a human or an animal. However I do not like the breed, I do not feel comfortable around the breed, and I really don't see a reason to own a pit bull since there are l00's of other dog breeds to choose from.