Ah, MB, 2 years younger than I, eh?
I remember 68 well, was near a war zone myself, Chicago, Democratic Convention, and chose not to go - had a hunch what was going to happen - the SDS/Weathermen were out for blood and they didn't care whose!
Watching the police action in Chicago, the lines of police in riot gear coming across campus (Washington U in St. Louis), ROTC building torched, fire men and trucks stoned when they came to douse the burning building, etc. proved a bunch of things, namely that
a) the SDS/Weathermen were lawless thugs,
b) indeed the thin veneer is very thin indeed, and
c) sometimes (more often than we are told) it is the gummint that breaches that veneer.
As for the police triaging parts of Memphis, proof yet again that they are not obligated to act on our behalf, only follow orders. Very scary stuff these days, as we witness the abuses every day.