To me, it's all about normalcy.
We don't expect to pull up to a public venue with our family, and see LE or private security with slung long arms.
We don't expect to see LE or private security at Starbucks or the local eatery with slung long guns.
If we do see this, most of us probably re-think our visit there that day, as it is abnormal, and possibly perceive an increased threat.
So why would anyone think seeing a bunch of questionable civiy's doing it would be cool?
Third world shit hole, with AK's stacked on benches, MAM's wandering around with long arms, with dead critter's hanging up by the butchers stall, right next to the guy selling dates and figs. Coffee so thick and black you can stand a spoon in it, in little bitty cups, (actually that coffee sounds really good). Yep, public carry of long arms is the normal at the hole in the wall, third world bazaar.
Not so much here and now.
If it did become the new normal, I would have to wonder what tragic event caused it.
Open carry, winning hearts and minds since...............Never