I cannot/will not disagree that some folks are clearly deterred by the sight of a firearm AND that OC should be exercised as a personal choice, but I always stress having options at your disposal is wise no matter your carry format.
I'm also not going to say that OC directly attributed to any kind of de-escalation as there's no way to prove that in this instance (sure sounds good in the story though). You said it yourself, kids to stupid things. By the way, if a CC'er had "brandished" in the manner to which you're leading folks they would have had it unholstered which ISN'T always true. CC'ers could simply uncover and be no different than if they were OC'ing. Interesting how that managed to get left out.
The CC vs. OC argument cannot be won by either side. We can converse on the matter until we're all blue in the face and make absolutely no head-way. We're here for the same purpose: 2A.