Are they really? A small but vocal (and sometimes tate supported) group of people are actually mad. Another group will mindlessly mouth such sentiment, but the majority seem not to care and just want to get on with their lives.

tyranny of the minority, as taleb would say.

You would have very little chance of knowing what Chinese people are thinking by the fact that thinking the wrong thing, let alone vocalizing it could maybe ruin you or your families life.

If literally all people whose opinion matters to you say and provide sound arguments that Taiwan needs to be annexed then if you are normal human (not a psycho) you'd eventually believe the same. And then who cares what those people really thought, because their expressed opinion is the only one that mattered. Sad, yes. The big issue with totalitarian regimes I guess.