I've used rigging components made in the US, Europe, and Asia. As a general rule if you pay what it's worth you'll get what you expect. Things that seem be too good to be true usually are. If you don't think anyone outside the US can make a quality product consistently you'll severely limiting yourself to who you can purchase from and probably spending more money than necessary to do it.
I think the important part is to be aware of the level of quality one is buying. That's why we submitted a sample to the architect to forward to the engineers. We never saw a report, only that the sample was acceptable for use - so we did.
There's something about handling and using "better" hardware that seems satisfying. Compare the fine grain of Anchor forged shackles with most of the cheap imports and their thick coat of zinc. I suspect some of the price difference is in the forge...
That said, one can get any level of quality in China one is willing to pay for and if you'll buy enough of it.