Or they’re not as nice as other breeds.

Pit bulls are involved in more dog attacks than any other breed. In fact, the American Animal Hospital Association reports this breed was responsible for 22.5% of bites across all studies.

https://www.forbes.com/advisor/legal/dog-attack-statistics-breed/

Whatever the causality is, the clear picture is that if you want to avoid being bitten by a dog, avoid pits first.