Earlier quoted context omitted.
I just don't see any historical evidence that superior weaponry always wins, whereas there are plenty of examples to the contrary. So I don't know why it's a "fact" that the dictator would still win.
Except the US military doesn't just have superior weaponry. It also has superior training, superior discipline, superior logistics, superior intelligence, superior force projection capability, superior everything . Unlike the Taliban or the Viet Cong, the US citizenry, even armed, would be like chaff. edit: so many downvotes. I guess I hit a sore spot. I'm sorry the truth hurts, guys and gals. :)
If we descend to such a state where an American president is (a) willing to completely annihilate the population, (b) can either bypass congress or get their approval to do so, and (c) can mobilize our military to perform the annihilation, then perhaps your point is correct.
I wouldn't exactly hold my breath on that.