My cousin swears they are gentle dogs and are only violent when trained to be that way. However, I have yet to see a story about a killer poodle or a killer cocker spaniel. Hmmmm.
You don't see assault rifle stories about Daewoos either, they're all about the "AK-47", when the media latches on to something they don't let go and just like how you don't see stories about a citizen giving some thug robbing his house/business a dirt nap with an assault rifle, you don't see good pit bull stories either. Many stories the breed of dog is reported as a pit bull when it's just some mongrel, or another breed entirely.