It says "no bad dogs, only bad owners" which is very often said by pit bull supporters. The truth is that it is in certain dogs' blood to kill.

Retrievers retrieve. Shepards herd. Pit bulls kill.

You can give certain breeds love and care it's whole life and it can still tear your throat out without a second's hesitation. It's no coincidence that literally every other dog attack is a pit. They're bred to fight. Hence the name "pit bull".