That's a really misinformed opinion. Labs figure surprisingly prominently in biting statistics, while most pitbulls are extremely sweet towards people. There are standard temperament tests to determine the level of dog's aggressiveness and other behavioural problems, and pit bulls score better than most breeds. I used to have similar misconceptions about the breed... but then I became a volunteer dog walker for the Toronto Humane Society and pit bulls just won me over. Despite the fact that the THS pit bulls have had a way rougher life than most, they are still amazing doggies. Some of the smartest and nicest dogs I've ever seen have been pit bulls. Their bad reputation is due to the aggressive pinheads who buy what they think a "tough dog" and then abuse it and train it to be nasty. Nobody buys a lab to turn it into a killing machine, so labs don't get all the bad press. But a properly socialized pit bull is a wonderful creature and certainly no more dangerous than any other breed.