What happens is that, because of untruthful reporting in US media, people in US does not know or understand what's going on in China. It seems a miracle that such a big country grew like crazy in 30 years without democracy. But if you how much average Chinese invest in their education and how hard they work, you will not be surprised.
The only real problem China is facing is its political system, not its economy. Compared to improving the political system, the economy is much, much easier.