Source? I lived in China and didn't ever feel like I was in a place without ethics. Different ethics, sure, but it really looks to me like you simply don't know or understand China.
The Great Leap Forward had nothing to do with routing out values, it was about hyper-fast industrialization, and it failed.
There are real problems with modern China, and, separately, with the CCP, for example a lack of separation of powers and a lack of rule of law. But your statements look much more like fear of the other and demonization of what you don't understand that well reasoned arguments.
If you live in China, you'll experience some things that are much better than they are in western countries. I'm not saying there's any comparison really, but the fact is that the reality is far more complex than you're making it out to be.