>pitbulls are the most common dogs that kill or maim people.

The real numbers of this are very wonky. If you say "large terriers" are the most common dogs to kill or maim that's be more true... But they're the most populous dog group in the US. Statistically mastiffs, great Danes, and huskies are the most dangerous vis-a-vis their population.

"Pitbull" is a nebulous breed, and often confused with other non-terrier breeds.