It's also stupid. A US civil war which went far enough to fragment the country would in actuality be a global WWIII and lead to billions of deaths.
And a new global leader, likely in the form of China. Which I'm sure everyone would see as an improvement. Right?
Why? The US is only 5% of the world population. If others successfully disentangle themselves before the civil war begins they can take steps to isolate themselves. Yes it won't be as peaceful of a world but I don't see how it is certain to end up in a WWIII scenario.