What your numbers fail to account for is how much more likely a Pit or a Rott is to be obtained for the sole purpose of biting people. Owners with those intentions abuse their dogs in numerous ways and chain them and leave them intact to increase their aggression.
I don't doubt that Pits and Rotts are responsible for the majority dog fatalities. They are the most popular of the large powerful dogs and they are routinely "trained through mistreatment" to hate people.
This does not make them more likely to bite a person because of their breeding rather because of they way they are most commonly used.
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1982 Honda XR80 - blown motor, 1993 Kawasaki ZX6D - sold, 2001 Suzuki Bandit 1200S - sold, 1984 Honda Magna - sold, 2001 Kawasaki ZRX1200R - blown motor, 2007 Suzuki DL1000 V-Strom - totalled, 2003 Yamaha FZ1 - sold, 1994 Honda Magna - sold, 2001 Honda CBR600F4i - sold, 1998 Suzuki DR350 - stolen, 1989 Honda Super Magna - sold, 2007 Yamaha Stratoliner, 2000 Honda CBR 1100XX Blackbird
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