They don’t want a civil war, they want full submission from their opposition, and nothing short of that. Anyone here who thinks differently is going to learn the same lesson that the Jews learned (too late) in 1930s Europe.
Obviously, if it takes a civil war to achieve that, then so be it...as far as the Left is concerned.
1936 Spain would be a good analogy as well; the leftist gubmint tried to “fundamentally transform” the country after a very close election, and it all fell apart. With rare exceptions, the gubmint never re-asserted control over any territory; what the military revolt controlled slowly grew until it was all over three years later. Before losing the war, the gubmint purged its own ranks of any centrists and left the operation of the war in the hands of the communists (and Spain’s gold in the hands of Stalin).
I have no illusions about a military role in this struggle; their security provided for Biden;s installation said it all (they are paid by Caesar, so they’ll do Caesar’s bidding - whoever is on the throne). I doubt they’d openly fire on American civilians, but I don’t expect them to support any opposition either. This will just be a continued low-profile war against the fringes.