Very likely that many of these places (like Detroit, Chicago, Minneapolis, Baltimore, and others) have very high black on black violent crime rates and that in turn plays that significant role, as opposed to the lack of gun control. It would be expected then, using the article’s logic as a guide, to have cities or locales in Montana, Vermont, New Hampshire, Maine, Idaho, and the Dakotas to be on this list.
This may not be politically correct enough for FR so I’m just going to link it.
https://gab.com/media/image/bq-5c72b52cbd363.jpeg