"Why are we trying to stop it when the Chinese clearly want to collaborate with us."
Who is "we"?
Not snark. A deep question.
Answering that will reveal a lot.
I'd love to leave it there as an exercise for the reader, but I can see it would be misinterpreted, or at least potentially so (this isn't about any particular characteristics of our leadership today, either hypothetical or real, my point is much more generic and world-historic than that), so I will expand with this bit: The leadership of the US has for the past several decades essentially been the most powerful leadership in the world. China challenges that now, as does Russia. Of course the leadership wants to stop that. You or I may not care in the slightest, because just because China is a peer force on the world stage or not may not impact our lives greatly, it's not like the only nice place to live in the world is exactly and precisely the most powerful one.But the leadership can care a lot more than the people they lead. This always happens when control and power fades. You can see many instances in history of such leadership of all forms and sources lashing out in rather predictable manners in ways that are oblivious to or even actively negative for the people they lead.
I think the citizenry of the US would generally be better off with a controlled welcome and some space given to these other up-and-coming powers, rather than fighting a war to hold on to power that they can't retain anyhow. I personally think even our military position would be better off, because it's better to retain your force projection ability and not fight, than to expend it uselessly and potentially enter into a situation where you have nothing at all. But a dumbass war on behalf of our leadership at the active expense of our citizenry is likely what we'll get even so.