On the subject of whether or not the populous being armed makes it more likely to be able to overthrow a dictator. The TL/DR version is that there appears to be no correlation between the number of guns a population own and their ability to overthrow a dictator.
This is something I became aware of due to my service (ironically) in the Peace Corps.
I served in Nepal during the first two years of that nation's civil war.* The Maoist rebels started out with very, very few firearms of any sort. Just a handful of shotguns and some antique rifles (muzzle loading muskets, even, with barrels made from water pipes, "grenades" made out of clay balls stuffed with black powder). They had no outside support (China was embarrassed their allegiance to Mao), except for perhaps some support fro Maoists in India (who were themselves devoid of foreign support).
The government side had police and military with rifles and some aircraft, with military support and training from the U.S. and Britain, including many who had served overseas on U.N. peacekeeping missions, those soldiers got extra training here in the U.S. Plus some who had served in the British military.
The Maoist didn't win the war outright, but did fight the war to a draw. In the peace settlement, the Maoist leader became Prime Minister and the King abdicated. While I was there, they were focusing attacks on police stations to get guns. Eventually they settled into "Winning by not losing", which is a real thing in guerrilla/insurgent warfare.
If push came to shove in America (or in Canada, anywhere with the similar cultural traditions), people would find a way, with or without guns. Here in the states, the brownshirts with the guns in the capitol buildings appear to be more like the ones who would fight to end democracy rather than save it. They'll only support the sort of democracy that gives them the outcomes they want, nothing else seems to count.
(*The PC kept us well away from any areas where there was Maoist activity. At the time the "war" didn't much feel like a war yet and was still pretty low intensity and localized to a few districts. When it got worse, the PC was pulled out. My post was perfectly safe from all that, I don't want to give the perception that I was serving in anything remotely like a war zone - although there was eventually fighting there, years after I left

).