Logically speaking about guns in the U.S.

Logically speaking, I think you are going to see the most mass shootings now in "open Carry" states that allow assault weapons in any form. Why?

Because if you can legally own or buy an assault weapon you can go into your garage and buy things from the most open carry states to modify your weapons in your workshop into a fully automatic weapon shooting off bursts of 30 to 50 bullets or more at a time. When you are spraying an area with bullets at this rate with an AR-15 or AK-47 you don't even have to aim because anyone within 100 feet of you is sure to get hit somewhere. So, logically speaking, it is where these weapons are legal to own (at any ammunition capacity) because they can be modified. IF someone can legally put their assault weapon on a gun rack behind their head in their truck almost anything can and will happen now in those states. Because those same states tend to have the highest percentages of White supremacists also living in those same states.

And all you will need is one or more of them going off into murder-suicide rage to take you to where we are right now for example, in Texas and other states.