Guess what? Other forms of organizing and protest will also be opposed. And we should still do them.
If a movement is real and serious that organizing to vote in primaries is really not a big deal. Blue no matter who is really just a last resort and if you don’t want to then you should at least spoil your ballot.
PS anything you consider more effective than voting can still be done btw. Change is not an all or nothing (tho given the mindset around many here they should not be surprised when they really do keep getting nothing)
The capitalist class as a whole already fully controls the media, police, and courts, with no oversight. The Republicans form a representative body of one wing of the capitalist class, but this is not something that can meaningfully increase power through revolution. The state represents the capitalist class as a whole.
As for Russia, Putin’s approval rating is around 76%. In Iran, the population is currently rallying around the government against the onslaught of Israel and the US. For the DPRK, according to defectors, about 63% of people support Kim Jong-Un, so the actual number is probably higher within the DPRK. I think your idea of “totalitarianism” is underdeveloped, Trump’s approval rating is about 30%, which is much lower than the countries you listed. Iran and Russia are reactionary nationalist states under threat from western imperialism, which boosts national unity in resisting this. The DPRK is a socialist country under siege, which also boosts approval rates.
The US Empire is the one bringing people together in resisting it.