To you and your source PK is that the urban area's will have the most ugliness compared to rural America. I have a former AI (Army Intelligence...I know I know an oxymoron) friend who is a member of this forum. He explained to me similarly, that if the military was called up to help...And they came, they would surround the large urban centers for humanitarian reasons. Just think what would happen if the SHTF in a large city like, Philadelphia, Baltimore, Washington, Newark, etc.
To be on the cautious side, I have put all of my extra electronics in the Faraday cage. Gas tanks are topped off, some additional basic supplies have been purchased, a couple of weeks/months earlier than I normally get them, etc. If the saber rattling goes up another notch or two maybe it will be time to withdraw some money from the bank, buy some kerosene, etc.
I just hope that my friends who are closer to the Washington DC rail road tracks will give us all a heads up. UP has many friends out there.