These are animals, not humans. Large dogs can flip out from time to time. Owners are not necessarily responsible owners. It happens. We don't outlaw dogs like Rottweilers because one attacked a kid down the street. Some cities have or tried to, but not on a national level.
There are over 50,000 police dogs in the US today. From time to time one will lose it's mind and yes, attack innocent people. That's no reason to get rid of police dogs when you think of all the good they do for law enforcement. These dogs are selected to be police dogs due to their breading of high intelligence, but nothing is guaranteed.
But back to the OP, CA is pretty much ran by Democrats and Democrats are criminals. They've taken measures or wanted to take measures to make things better for the criminal, that's their only motive in proposing such a law. Blacks are renown for their extreme fear of violent dogs, and that's why they want to get rid of them.