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According to the CDC, in 2013, there were 32 deaths by dog bite in the US. 26 involved a Pit Bull or Pit Bull mix.

In a CDC study from 1979-1998, they found reports of 327 people killed by dogs over the 20-year period. Some breed information was available for 238 (73%) of the fatalities. Of 227 incidents with relevant data, 133 (58%) were unrestrained dogs and on the owners' property; 55 (24%) were loose off the owners' property; 38 (17%) were restrained dogs on their owners’ property; and only one (less than 1%) was restrained off the owners' property.

Just a few facts in a sea of opinions (including mine!)

rentz wrote:

suthdj wrote:So you have 2 pits, twins, 1 raised to be mean and the other loving. Your out walking with your 5yo and wife and one of these dogs is running at/to you are you going to wait for it to bite/lick you to deterimine your course of action, so by its very action of not being restrained it is a threat even when it might not be. Hate to say it to all the excuse makers if your dog is loose and gets shot or hit by a car look no further than the mirrior for someone to blame.

the ultimate responsibility is on the dog owner, they need to be responsible and not let their dogs roam and try to keep them confined to a house but even the most careful dog owner might have a dog get out at some point for one reason or another.
Every situation is different I would just hope people have enough training and ability to properly asses a situation.

^^^^^^ This