Worrying news, as you say, it mirrors our Brexit tribulations which also are proving hard to heal. Thankfully we aren't packing as many guns as the Americans but I could see it all going off in the US at this rate.
Pretty much the same analogy for the vote for brexit, people felt they had nothing left to lose and when the Tory Boys said " We Are better in Europe " it was a chance to stick two fingers up. When you have lost so much hope and seem to have nothing to live for, then, you have something to die...