In the coming second American Civil War,

[Hortensis]

53. Agree. Except question how dysfunctional we might become overall.

Just imagining national or large regional breakouts of violence, etc., which I believe is very unlikely, though:

You make a huge point about interruption of food and water. Also power. And communications. With notions of people fighting in the streets, those would tend to happen at different points in different places to different degrees -- both intentionally and unintentionally. But where occurring, it seems likely the very interruptions they caused would act as brakes on civil hostilities by forcing people almost immediately to tend to very basic needs.

Plus whoever controlled governments, federal, state, municipalities would impose control, closing roads, controlling communications, imposing and enforcing curfews, likely not caring who was on which side, and deliberately turning off power and water to force whole neighborhoods, counties, areas of states into compliance.

This isn't 1776 or 1861. Lack of water alone would bring people to their knees very quickly.