Essentially your arguing a black man is more likely to kill someone...

I find that an absolutely batshit take based on what I mentioned. In reality, dog breeds are a considerably different situation, with centuries of rudimentary-level genetic engineering involved in order to create a range of dogs with specialized characteristics and behaviors.

Of course not every dog in that breed is going to have exactly the same personality, but the point is that different breeds will have considerably different temperaments exactly due to what what humans wanted from that line of dogs.