Yeah.. I have heard dalmations aren't the family dog they are portrayed to be on 101 Dalmations..

here is one link.. http://www.dogbitelaw.com/breeds-causing-DBRFs.pdf
I know it is outdated.. I am looking for the one site I found interesting.. I realize Pit Bulls aren't the only dog who attacks and kills.. but, they are the breeds most often found in fatal attacks between human and dog.. my husband found a study more current. here is the link
http://www.dogbitelaw.com/Dog%20Attacks%201982%20to%202006%20Clifton.pdf

http://www.dogbitelaw.com/PAGES/statistics.html#Thedogsmostlikelytobite - another link that offered the above link. Excellent resources.. and lots of infor.

http://www.dogbitevictim.com/ - A list of victims and their stories. Not all are from Pitbulls, but most of them are.

as for dogs who bite.. those stats aren't as accurate mostly cause people don't often report dog bites. examples.. friends and family don't often report dog bites. My son was biten by a puppy when he was walking down the street. a chunk out of his arm which eventually healed .. we did go to ER room to make sure it would be okay. We didn't give specifics since we didn't want to see the puppy killed.. his owner was harsh enough.. several months before that.. we had an employee who had a Pit Bull. It supposedly was her husbands dog and he had passed on a year earlier.. well, her dog bite my thigh when I went to her front door, and 2 months later bit my son in his leg.  We didn't report either bite since the pit meant something to her.. when she moved.. we learned  of 2 others who were bit before us.. so peeps don't often report dog bites..