I dunno about you but the events of the past year have proven that a destabilised US lacks credibility in its attacks on China-which is great for China, needless to say.Don't be daft. China benefits from STABILITY. A destabilized US would be terrible for China and for the world.
All China needs to do now if it really wanted to twist the knife is to arm and train militia groups in the US, be it the NFAC or the plethora of white supremacist anti government groups; there are so many far right christian fundamentalist militant groups in the US, all it takes is a few well positioned pressure amplifiers and the whole rotten edifice comes crashing down.