In general, I agree with you. I would not use the current US as a stirling example, historically, though the US system has been largely successful. We probably disagree on the level of success though.
I can't speak from the US perspective, but in Canada many people come and they like it here. Not just because of status or money. Because people don't just need or want status or money. They like it here because here we actually work to balance security and opportunity. Not everyone is happy. But they're not unhappy and without rights, they're just unhappy. Liberal democracies have been trying to create [Rawlsian justice](https://en.wikipedia.org/wiki/A_Theory_of_Justice#The_Two_Pr...) and some have been more successful than others.
I think the idea that economic success and liberal democratic values coincide has been too quickly conflated. I share your view of West - China trade. The West thought that liberalizing economic markets would naturally cause liberalized societies and democracies. Allowing China to enter the WTO without serious stipulations and controls to ensure democratic transition was a mistake. And now they flaunt their economic "success" as the sign of a successful counter to democracy. Western industries and governments that cozy up to China risk serious moral hazard and we are already seeing the effects of that.
We missed our chance to seriously allow a liberal China to take shape when it would have been best to.
But China still relies on the west for trade. And that is our leverage. Going alone against China is suicide. As a block of democracies, however, we could stand up to them quite easily. We just can't be greedy. That's a hard sell in 2019 apparently.