I don't know why you characterize revolution/civil war as singularly right wing when history has shown most civil wars are started by left wing radicals. Neither Lenin nor Mao were right wingers. The closest we've come in modern US history is left wing groups agitating for civil war, or at least overthrow of the existing government, which is basically the same thing.
Personally, I will stand behind the Constitution and fight for the government if they are behind the Constitution as well. I would not defend a government that had abandoned the Constitution.
Donald Trump came into office by due process, duly and legally elected, yet there is a "resistance" movement out there, some of whom advocate violent overthrow of his administration, which would indeed mean civil war. The threat isn't solely from the right.
“WAKE UP & JOIN THE RESISTANCE. ONCE THE MILITARY IS W US FASCISTS GET OVERTHROWN. MAD KING & HIS HANDLERS GO BYE BYE,” she wrote on Twitter. Sarah Silverman
“The fourth possibility is one that until recently I would have said was unthinkable in the United States of America: a military coup, or at least a refusal by military leaders to obey certain orders.” Rosa Brooks, law professor and former Obama official
https://www.theepochtimes.com/advocating-a-coup-against-trump-is-against-the-law_2218176.html