Countries rise in power together all the time.

Look at Asia and Europe in the last couple decades.

Also I think you exaggerate the differences between the West and China. The US these days is by no means a beacon of liberty and fairness. And China is no Taliban-level opressor. Yes, there's quite a lot of poor behaviour on their part but I see it as roughly the same order of magnitude as most non-european countries.

The Chinese people are idealogicially pretty damn similar to the rest of us, that is, they're human.

As for their government, on the global stage they're being far more cooperative and rational than the US is these days, even if they're being pushy in their neighbourhood.

Also, come to think of it, it's the US declaring illegal wars recently with hundreds of thousands dead and you know, causing ISIS. What did China do that compared to that?