Cuz they kill people, and people getting killed is still news in most markets.
because if they are raised properly, they are very friendly, very sweet dogs.
They usually aren't raised by people who want sweet dogs. If they wanted a sweet dog, they'd get a golden retriever.
They're not any more vicious naturally than any other breed of dog.
Unfortunately, selective breeding actually works. They are naturally built and tempered to be exactly as aggressive as they often end up. It's no accident... it's design.
Funny you mention Retrievers because they are statistically more likely to bite people than Pit Bulls are.
See also my reply further down.
That's where you're very wrong. I know people who raise pit bulls to be nice dogs. I know I do. I have one. Mine is as nice as any other dog. So you have no room to say that people don't raise them to be nice dogs. Besides Golden Retrievers suck!!!!!!!!!!!!!!!!!!!!!!