All kinds of dogs bite people. Pits or any other large breed dogs can do a lot more damage than say a poodle. But there's zero evidence that shows that they just "snap" sometimes, that's a load of bullshit.
There's always an idiot like you that comes in shining armour defending these pieces of shit
"Pit Bulls have truly earned their reputation for the most aggressive breed of dogs, as well as their number one spot on this list. The CDC research attributes 66 deaths to Pit Bull bites and attacks. A study shows that 94% of pit bull attacks are unprovoked, a fact that makes this breed all the more dangerous. This breed of dogs is responsible for one third of all dog bites in the USA. Pit Bulls are vicious and naturally aggressive, and are often bred for illegal dog fighting. They also tend to attack smaller animals and young children. It is because of this that many countries have banned this particular breed.
Real life incident- Pamela Devitt died after being bitten by a Pit Bull 150-200 times in California. The dogís owner Alex Jackson was charged with murder. Jackson, according to the police, knew his dogs were vicious and had attacked people earlier as well."http://listdose.com/top-10-dog-breeds-that-bite-the-most/
I also personally know a girl that was attacked by pit bulls when simply walking on the street. Her upper body is full of scars. A bystander saved her from death. Hope this helps.