It was always easy to dismiss those as uninformed morons, but Signalgate showed that at least Vance and Hegseth truly believes it, and who knows how many more of their ilk.
Up until 2016, the US was predominantly governed by people who understood the post-WWII world order, who understood the immense benefit of Pax Americana to the US itself. People who understood soft power and diplomacy, people who understood that although the upfront costs of maintaining the military hegemony, of playing world police, the benefits far outweighed the costs. People who understood mutually beneficial trade agreements, and that a trade deficit is a small price to pay to maintain the USD as the world's reserve currency.
But now, it's the spoiled grandchildren who are in power, who have been brought up suffused with the exceptionalism such that they take America's position for granted in eternity. And they look at the cost of all of these things, how much it directly benefits other countries, and react with stupid short-sighted greed, thinking that getting rid of the "free-loaders" will make them richer.
I remember the TPP trade deal. It took eight years to negotiate and the US strong-armed everyone else into accepting its provisions on IP, which would have allowed the US to maintain its position at the top of the value chain, countering the ascendancy of China.
All gone, in the trash, because the people who are once again in power fundamentally do not understand how it would have strengthened the US. So now we're back to some kind of mercantilistic trade-war, that the US will lose.