what you say is ideally true, but it ignores the complexity of the system: free trade works great if everyone acts in the best interests of the whole, but game theory tells us that even a few bad actors have the potential to ruin the whole thing (this plays out time and time again with monopolies, negative externalities, etc)

plenty of countries around the world don’t play fair, and that leaves everyone else worse off… you can’t assume the game is fair when it’s actually rigged

we can still encourage trade, fairness, interconnectedness, and efficiency whilst not falling prey to being taken advantage of

we can’t let perfect be the enemy of good here: there’s a balance to be struck, until all of the worlds economies play by the same rules