"Let China's people decide" - please tell me how you expect people to decide without a democracy?Let China's people decide what government they want. Their government has pulled 1.4 billion people out of poverty and on the way towards the biggest economy in the world. It still has high approval ratings. The East Asian culture has always been willing to sacrifice personal freedom for stability.
There is a long history of Chinese people overthrowing governments that no longer work for them. In fact, they've been doing it for thousands of years before the US even existed. The US doesn't need to interfere in everything.
A democracy like the one in the US probably wouldn't work in China anyways due to culture, history, and population size.
Check out India. It's a democracy but it's still corrupt as hell and its economic growth and internal stability haven't been close to China's. In 1990, India had a higher GDP per capita than China. Now China's is 5x higher than India's.
People in the US shouldn't try to dictate how 1.4 billion people should live and be governed. The US has always tried to dictate how other countries should operate by trying to install new governments (sometimes a democracy and sometimes a dictator) - usually with an economic goal that benefits the US. China doesn't want that because European colonialism messed China up for 100 years (google "Century of humiliation").
Let China be China. Just focus on USA problems.