Once again, implementation. If you countenance capital punishment, the RWers will latch onto it as a legally convenient way to get those pesky negroes out of the way. Social issues are complicated, RWers lack nuance, they will take what seem to be reasonable ideas and turn them into shit. I have seen it over and over and over again.
Also, using crime dramas to bolster your stance is typically not well considered. I mean, I have seen numerous episodes of Gunsmoke, but I have no illusions that we would all be happier living in Matt Dillon's Dodge City.