I think the Left really didn’t brain storm this fascist putsch of Obama very well, for example, as you noted, the Oath Keepers, who have signed on vast numbers of military and law enforcement officers will refuse to fire on their fellow countrymen in case of rebellion.
This is world ruled by force at the end of the day and when those in uniform who carry the guns either refuse to fire on the rebels, or go over to the rebels, you cannot rule.
The reason why in Nazi Germany Hitler had the military and police to swear a personal oath to him. He was well aware they could overthrow him at any time if the oath was to Germany.
Thus ‘bammy’s need for a “Civilian Defense Force”, likely sworn to him instead of the Constitution.