Pardon my ignorance but who or what is "12"? I keep seeing references to "12" in all the burned out buildings and graffiti.
I join you in ignorance of "12" in this context.
More remarkable (not surprising) I find the ignorance of the protesters who defaced the plinth of the Farragut statue. Farragut's victory at Mobile Bay was a contributing factor to Lincoln's 1864 re-election, which effectively sealed the fate of the Confederacy.
"Blue on blue" vandalism by clueless radicals.