That doesn't mean that they can't do more de-escalation or take other steps, but the high prevalence of guns does seem like it would be a contributing factor.
(I realize this touches a hot topic (guns) but it's an honest question, and sympathetic to law enforcement.)
As a born and raised American, I'm inclined to think not. I could be wrong of course, but everything that I've seen and experienced growing up and living in the US has led me to believe otherwise.
I want to think that more protestors being armed would make a difference, but ultimately I believe it will just lead to escalation and more deaths by cop (and/or the national guard, as we're finding out in Louisville currently).