"Shut up, Y is bad."
Uh.
I think you are projecting the warlike tendencies of the US onto China.
No one is saying something like that is likely. We are discussing hypotheticals. There's no need to be so upset.
I believe that GP is trying to generalize that question to "what is the proper response to any hyper aggressive nation". And the fact that the answer to that question will have more profound effects on responses to the US than to China.
In fact, I think that the question is valid. Limiting the discussion to China is blatant anti-Chinese propaganda. Broadening the discussion to "hyper aggressive nations" is fair and legitimate.
I assume your reading list is approved in Langley
I'll also remind you Tiananmen was internal, whereas all of our wars are just that - wars. Directed against other nations.
edit: to clarify, I don't see how Tiananmen suggests China will go to war, but I do see how a sordid history of spurring violence across the globe suggests the US will go to war again.