I think that GP's position is tenable if the tyranny comes slowly. Sure, a country-wide armed insurgency is hard to beat. That's relatively uncontroversial. If most people are comfortable as the water boils around them, however, then the armed insurgency is not going to be country-wide.

I think that argument has some basis in history (e.g. Nazi Germany), where the tyrannical government slowly got worse and worse without major internal revolts. On the other hand, there have been times where the people snapped and revolted all at once.