They believe we have some kind of Wiemar Germany situation where communist street gangs are rumbling with a Trump version of the Freikorps and eventually it's going to escalate into full scale warfare. Elements of the federal government will gravitate towards one side or the other and supply them with troops and tanks or whatever I guess. It's part of the liberal worm brained belief that the US government has a diverse set of ideological stances within it and can be guided in that manner, rather than the state simply being the violent bureaucratic apparatus of capital.