First off, that's an amazingly vague term "gun-related homicides".
Second, like many such maps, it's mostly just a population density map, so not especially informative.
Third, notice that corner up in New England which is almost entirely blank? Hmmm, I wonder what the racial demographics of that area look like. Would you care to place bets?
Seriously, you imbecile, if you think this map is making your case for you, you are not intelligent at all.