I live in Austell. We had no problems during the epic floods of 2009. They knew the local LE were turning a blind eye and they knew it was real easy to let the flood wash their asses down to west point.
I figure those north of the river will be in a good strategic position to defend, High ground overlooking the bridges. Control the bridges and the ain’t goin nowhere.
I think you are right. Also look for every exit on I985 to be blocked by armed guards. Those communities will not be welcoming outsiders.