It's also instituted a very oppressive social credit system and runs an enormous censorship apparatus that it will be increasingly able to turn outwards in the future.

Its really about their ability to destroy Western democracy - which is already happening.

It's more complicated than that. Few decisions, particularly ones regarding foreign policy, are made on single factors.

They would also stop big bunch of other things.

The US has too many internal problem to be the world savior. Every time the US looks outside its border, it's for its sole selfish interests. Human rights enforcement around the world is (unfortunately) not something we can reasonaly expect from US. Also the U in US is extremely optimistic. Different states would act completely differently if allowed to.

The world need to look for a different hero: any proposal?

(For a good laugh, I reccomend watching the excellent "When the Yogurt took over" on Netflix)

Democracy, human rights, and self-determination as a concept should be the hero.