Edit: Dreher has an excellent book called "Live not by Lies", that explains a theory of soft totalitarianism. Combined with the devestating power of weapons, the reluctance to use them, the powerful surveillance state, and the strong desire to live in comfort means that we might not see a conventional civil war.
As an example: gun owners largely fear getting raided in the night and a violent standoff like Ruby Ridge. I suspect much more likely, they will get a call from CPS notifying their children are being held until investigators can confirm the reports of firearms in the house -- or perhaps credit cards and finances being shut down. Why go for a risky confrontation when you can bring someone to their knees with a button push?
If there is a cold civil war, I expect it will be waged asymmetrically instead of conventionally.