Of course they're trying to take care of themselves while the US implodes, how can you blame them for that? The whole world has a serious oil problem right now, because of US actions, and of course each country is dealing with it in their own way. Why is that a problem?
"Problem" is a relative term for those dealing with the consequences of it. It is one if you are America means a whole lot less economic freedom than you had in the past. If this is a good thing or not depends on your position.
If you're fired up by nationalism but your nation is sucking, getting mad at the Chinese isn't the answer. And that's before we even get into relative levels of activism, Chinese political ideology is much more biased towards "neutral, just trade" than American politics.
Near as I can tell, they fundamentally believe that the US actually can’t do better (despite protestations to the contrary), at least not with them there doing there thing, which is why they get so manipulative and shitty. They are unwilling to make other decisions than the ones leading to these outcomes.
Yes people, it is actually possible to do better. It requires making better choices, however.