There’s a great podcast called ‘It Could Happen Here’ about what a second American civil war might look like. Generally, no it wouldn’t be two-sides standing against each other in a large scale war. But factionalized regional skirmishes like you said. And acts of terrorism would likely play a large part. The Syrian civil war is very likely how it would look.

Also keep in mind the American civil war had a fighting force of 10% of the population. Most of the population in a war don’t actually fight. I can imagine some percentage of Trump’s far right wing of his base would be angered by his death enough to commit acts of political terrorism, which would provoke response from some percentage of the far left radicals. Things can boil into all out war very quickly, overnight even.

Anyway, it could happen. Not saying it will, but I don’t think we can say people are too lazy for it to happen. I hope you are right that people are too lazy, but I just don’t think that’s the case.