First it's very short term thinking by China. Victory is assured for them if the boat isn't rocked too much and they continue the path of economic integration and economic growth. Their economy will be 2x the US economy and then they will be in a better position to assert their geopolitical interests.
Second consider the consequences to China of NATO expansion in the East, which the UK has started to discuss as a good idea in the last few days. That is not good for China's geopolitical position.