Oh wait, they did have guns, and yet they're dead too...
Well... Not really. The Jews of the Warsaw Ghetto uprising had very few functioning firearms. Most were unarmed. Those who were armed were mostly armed with handguns. Jewish forces had a few rifles, but not enough to matter; which makes your next statement immaterial:
...and the gap between the firepower a private citizen can muster and the firepower a military can muster is even bigger today than it was then.
The gun-owning Jews of Warsaw can hardly be compared to gun-owning Americans of today. They didn't have "black guns", they didn't have scoped deer rifles, they didn't have mountains of ammo. They certainly couldn't head on down to Walmart to stock up. Above all, there weren't 80-100 million of them! The "gap" as you call it is nonexistent.
I wasn't the one who brought the Warsaw Jews up. It's not my fault if he uses poor examples to support his point. I used the most charitable interpretation of what he might mean by citing the Warsaw uprising: assuming it was supposed to be a contrast and not merely a redundant repetition.
"The gun-owning Jews of Warsaw can hardly be compared to gun-owning Americans of today. They didn't have 'black guns', they didn't have scoped deer rifles, they didn't have mountains of ammo."
They didn't have tanks, and planes, and artillery, etc, etc, etc. And neither will we.
"Above all, there weren't 80-100 million of them!"
Which is itself immaterial, because there will never be 80-100 million Americans in arms against their government. It's a matter of will to fight, not access to firearms.
Note that in this Warsaw example, we've once again switched from a domestic tyranny scenario to a foreign invasion scenario. If a totalitarian government ever comes to power in the United States, it will be by imposition from a foreign power...or with the support of the majority of Americans, just like it did in Hitler's Germany. Which is why some of us recognize the real solution is proactive and preventative: winning the cultural and political battles.