First of all, during the story, not a single argument that you made had a bit of logic either.
1. Communism has no logic. It's a principle that fails the "human nature" test and only works in a magical idealist utopia that will never happen. It is incompatible with democracy and success for two reasons:
a. It promotes a ridiculous goal of a "equalized utopia" with no government and no leader. That's just an excuse for dictators like Stalin, Mao, and Browder (in this timeline) to sway the opinions of the common mass and take control.
b. Economically, it's fundamentally incompatible with human nature, as there is no motivation to do well (everyone gets paid the same, why should I try to work hard?) and since in most "workers' utopias" it's impossible to fire workers but the people in charge don't have to do a bloody thing, leading to the "we pretend to work, you pretend to pay us" problem.
2. During the US Civil War IRL, there were still plenty of peace democrats that strongly opposed the Civil War and at some points were pretty close to threatening Lincoln's agenda. In all secession crises, there are always people who stay in the union but want peace. In a two-party system that promotes free speech, there is ALWAYS an opposition party. The whole "well, all of the capitalists left, so it makes sense that the only presidential candidates were communist" is one of the stupidest things I have ever heard, as in a free speech encouraging democracy, there will inevitably be dissent. The fact that the election of Browder was a complete joke shows that the communists had taken over then. Even though the communists won democratically the first time, they should not have clamped down on free speech and paved the way for the "election" with only 1 party.