I keep wondering whether this could happen. I know, from what I read, that there is a growing and festering antipathy towards the federal government. If this is so, some event, perhaps related to intrusions into people's private lives such as outlined here, might set off episodes of isolated violence and gosh knows what could follow.
I think secession ala the Soviet Union is a best case scenario, that was more or less peaceful. I doubt that will happen here.
For the paranoid, get yourself a CD or USB with TAILS. https://tails.boum.org/ Boot off that when you want to use the Internet.