The kind of people that own guns also tend to be the kind of people who don't see anything wrong with police brutality.
It’s sad to say, but I think that might actually be a smart way to promote better gun ownership laws in the US. Using racism against itself: black people (legally, openly) wearing guns might be a good (but really dangerous) argument against any people wearing guns.
Or it'll just be a way for black people to get shot and killed by police, just like black people having their hands up and not reaching for an object in their pocket which police erroneously believe to be a gun apparently is.