Yours is the wrong citation. See my other post for the correct exemption.

Boston is your big city, right? It had 56 people murdered in 2018. Here are their pictures. https://www.universalhub.com/2018/boston-murders-2018

As near as I can tell from the available pictures, the victims are largely or entirely black. They make up 23% of the city, according to wikipedia, or 159,754 people. So that is about 35 black victims per 100,000 black residents.

In 2018, Chicago is about 40 black victims per 100,000 black residents.

This is comparable to black victim rates elsewhere. I don't think that your gun rates are helping so much as the fact that you are a mostly white state without many urban centers.