You're arguing with folks who just want to be angry, not listen to facts or sage observations.
(it's not like the US is innocent; we have made a huge number of terrible mistakes attempting to maintain the Pax Americana. I fully acknowledge while being fairly sure that China could and would do far, far worse than the US)
This speculation that China could do far worse is totally unfounded given that they've had plenty of time to push buttons militarily that the US and the Soviet Union had already pushed with much less military power.