Anyone predicting Civil War II is probably too deep into their own ideology. The Civil War was a regional conflict, which is an important requirement. Democrats and Republicans may be very opposed to one another right now (at least in surface rhetoric; when we bother to discuss deeper than a few big issues we usually find more in common than not), but there's not much regionality to it. Every rural area rebelling against the nearest city isn't exactly the same idea as entire states deciding to secede.
There are states that seem to be seriously considering secession. It would be a rational response to the belief that other states are manipulating the vote.
That would bring along a lot of people who don't hold that belief.
Just to expand with more specifics: There was a movement in the mid-90s that tried to convince everyone that Texas never properly brought back into the union, and was trying to re-declare itself as the Republic of Texas[0]. Part of Oregon wants to become part of Idaho[1]. The idea to split California into three parts[2]. These types of things don't happen when everyone is full of brotherly love and is happy with the status quo. If the GP thinks that Civil War II is so absurd, I'd suggest that's just way more optimism than I would ever be able to achieve. As things are progressing, a situation like Gilead from Hand Maid's Tale is not too far of a stretch.
