1) over 800M rural population with most of them under-educated. High school is not common and the villagers will celebrate if one of the kids made it to college. If you want them to understand democracy good luck educating millions of people across vast areas(thanks to Chinese government you might be able to take trains)
2)Middle and upper class Chineses have more different point of view, but they rarely choose to move since it’s against their own interests
3) The other countries listed
are historically US strategic allies with even US troops deployed. Ironically what US did will only pushback Chinese people from wanting western style democracy
I believe democracy in China will happen one day (I believe it’ll be top-down) but the majority of the population doesn’t have any motivation right now
Obviously democracy isn't traditional in Chinese culture, or just about any culture including "the West" if you look back more than few centuries, but that doesn't make it a bad idea.