Could it be (gasp!) that the power is largely distributed among those people who overwhelmingly support that government?
Democracy doesn't work when it's top-down. In the West, the capitalist and ruling class is capable of exerting control on public opinion and therefore on elections. The same is true of the CCP, which can influence public opinion as well. The best way to combat this is by emancipating individuals so they are able to resist state propaganda. China has a dogshit score on the press freedom index, so good luck educating the people on the shortcomings of the government. The government is intransparent and oppressive by design.