Opponents of open carry are blithering NRA old school Zumboesque Fudds or prancing modern metrosexual gungrabbers.
Simple truth: Open carry proponents generally regard their sidearm as a tool to be used quickly and efficiently in the face of dire threat-animal, human or otherwise. (Yes, sometimes a firearm is a most effective signaling device,something your Grandfather understood and you have forgotten)
A fact the”vast overwhelming majority of idiots”in American Culture do not understand about open carry is proponents do not necessarily regard every human they meet as a threat and if they do their use of open carry immediately signals they are educated in threat and have adopted a posture of immediate and effective reprisal.
Thus both Police and Military open carry THE TOOLS OF THEIR TRADE and people around them understand they are educated in their use.