So how do you oppose a government that is the sworn enemy of values you regard more precious than your own life?

It's hard not to be the enemy of such a government seeking to increase its power and influence on the world.

Totalitarian governments rely on distraction and misdirection of the populace in order to survive. Without it to use as ammunition to unify the people against a common "enemy", the very nature of its limiting rule forces the populace to start questions to try and improve their own condition. Questions like "freedom" and "censorship". Totalitarian governments are not equipped to satisfy difficult questions like this and will either adapt or crumble.

Thus the best way "oppose a government that is the sworn enemy of values you regard more precious than your own life" is to allow it to face its internal problems without giving it the "enemy" it so desperately needs as ammunition to use against you.

I don't think that setting up an enemy is what Chinese government needs to survive after 1979. it might be used to. on the contrary, what they need to survive now is to keep their economy stable and strong to prove/maintain their legitimacy to rule the country.