I think it ultimately boils down to how real power operates in the countries. The average Russian or Chinese citizen is way less powerful than the average American citizen. If they have a grievance to make, whether it's against a local or national policy, Russians and Chinese have way way fewer options.
Whereas Americans, if they feel aggrieved at the state of their world, can turn to any one of many many many political organizations that exist solely to collect and distribute that outrage and drive results. We may not be completely 100% satisfied with those results, but it's better than relying on the legal process.
This network of civic participation has mostly replaced the usual role of electoral politics and Americans believe in their system, secure in the realization that if some bullshit is going down, outrage will be generated and justice will be served.
The last election threw that whole system into critical disarray. It got yoked into the service of Donald Trump and the Republicans because liberal Americans trusted the system enough to stop looking to see how it was being used. Trump realized he could game the system to get elected and did exactly that.
The critical insight here is that Americans are not stupid, and they are not ignorant, they just believe in the power of systems and institutions and want to just be able to rely on them to drive better results over time. We shift public attention gradually away from everything, and slowly onto the parts of the system that aren't working.
In Russia and China, public arms of policy-making are non-existent. Citizens must therefore be extremely careful about picking their battles.