I'm curious how you suppose armed conflict would have helped Americans of Japanese descent during World War 2. Even in Los Angeles and San Francisco they were a minority, and were viewed with suspicion by much of the rest of society (Americans of German descent mostly gave up speaking and writing in German, despite being a plurality). It would have been almost trivial for the government to eliminate sympathetic feelings in the rest of the population by simply issuing propaganda saying that resistance by Japanese-Americans was actually a guerrilla campaign on behalf of the Empire of Japan.

So then what? Japanese-Americans give up all their possessions and live the hills? Where would they get food, guns and ammunition? After the war, there would be no way for them to reintegrate into society.

As for the Black Panthers, I would argue that images of them carrying weapons in the media did more harm than good to their cause. Today few people remember them as a community service organization and most remember them as a sort of quasi-terrorist death squad. A recent presidential candidate was even intimated to have had some sort of nebulous association with them as a way of tarnishing his reputation (though I hear he won anyway).

So I'm underwhelmed by arguments that guns are going to stop a tyrannical government. They may stop one that is completely inept, but a government with even modest propaganda resources will have no trouble playing one group of citizens against the other. Firearms enthusiasts aren't going to be portrayed as 'freedom fighters' by the media: They will be called 'terrorists' or 'cop killers.'

Not that I'm against gun ownership (though I don't personally own one). I just don't live under the misapprehension that it's going to magically 'solve government.'