Should they ... well they are critically-dependent on it, can't control it, can barely police it, can't assure access to it, can't guarantee healthy relations...

The funny thing is, ARM is European tech - and it's the processor architecture behind most of the world's devices. Linux, also European, runs our network infrastructure and cloud servers. LibreOffice is another European innovation, and in my opinion, it's better than Word (though not quite as good as Excel). And let's not forget SAP, which powers much of the world's supply chain and enterprise resource planning systems. My point is European technology quietly powers the modern world in ways that are often overlooked. If there's any worry, it's that the US is too dependent on European tech.

Should Ernest Hemingway have weaned himself off alcohol?

Yes, obviously.

But there is a whole lot of Difficult Stuff in between "should" and "could". Let alone "did".