The best a broad civilian uprising could hope for in the US would be a drawn-out guerilla grinder like Vietnam or Afghanistan. Anybody who thinks it would be a one-way wipe (in either direction) is an idiot.

Not to mention that a dictatorship would be more than glad to support counter-revolutionaries, which would outnumber the left-leaning revolution by… A lot.

And that, kids, is how we installed a lasting, stable, friendly, democratic government in Afghanistan!