1. China does not want war. It just wants its rightful territories back, those that were annexed by foreign powers when it was at its weakest.
2. Even if China were to do what Trump did, the US shills would immediately call out China and say: See, we were right, China is a big bully... you can't trust the commies! But when Trump breaks all rules, he is a hero! He can do no wrong. Even boss Sam sings his praises.
See the double standard? Damned if you do, damned if you don't. Such is the nature of the prejudice of the American cocksuckers here, brainwashed on a daily diet of lies fed by the Western media.