It is beneficial. I generally believe in free trade as long as both sides have agreements in place that follows laws and policies mutual to both parties

However not every situation is like this. For instance, offshoring was used to artificially suppress wages of IT workers. That’s not mutually beneficial in the slightest. It’s abusing one cost advantage over another without a clear benefit to both sides, it only served to enrich shareholders

To top this all off, our ability to "put the domestic economy first" through policy is non-existent. Any attempt to fix this "problem", that you accurately described as a problem only because it's socially unacceptable, would end up harming us in some way. There is a mountain of evidence over the last century to back this up, we just refuse to listen.