I've been around a few, I avoid them whenever possible, along with ANY other breed of dog capable of overpowering and killing a person.
And as to assumptions, yes I assume that the hundreds and humdreds of news stories can't ALL be wrong when describing the unprovoked and often deadly attacks by breeds such as pitbull. I assume that the attacks actually happened and children are DEAD. It happened near Chicago fairly recently, two pits jumped the fence, ran into the nieghbor's yard and brutally mauled a 7 yr old child to death. Ripped his throat out and mangled his head and face so badly that he no longer looked like a person. I'm sure it was all hype. I'm sure I'm just a dupe of the media hysteria.