Nope - Race is a Social Construction!There is dumb and there is dumb.
So, in the big picture, Labrador retrievers and pit bulls don't actually differ very much genetically. They do differ genetically on a very small number of genes. But some of those few genes that differ are related to biting. Labs tend to retract their teeth and gum whatever they're handling with their mouths, while pit bulls tend to bite down and, more unusually, not let go while they whip their heads back and forth. So, that tiny, tiny fraction of the dog genome is important when deciding which breed of dog to buy depending on your needs -- e.g., pet for your toddlers or guard dog for your crack stash.
By the way, here's Malcolm Gladwell in 2006 arguing that opposition to pit bulls is racial profiling and therefore immoral and ineffective, just like racial profiling of humans must, therefore, be.
The great thing about Malcolm is that he lacks the Uh-Oh-Let's-Not-Go-There gene that makes most spouters of the conventional wisdom prudently change the subject when they find that the logic of their argument has carried them to the edge of reductio ad absurdum.