https://cvafoundation.org/does-the-us-subsidize-european-def...
https://cvafoundation.org/does-the-us-subsidize-european-def...
It's cheaper to subsidize European defense than to let them arm up and start fighting again. The lack of large militaries in the second half of the 20th century has lead to the longest period of peace in Europe in about 1500 years.
What would be smart, as has been shown by the invasion of Ukraine, would be to integrate the NATO supply chains more deeply (for the same reason we do multipath and redundant routing). This wouldn't threaten US jobs or safety, but instead make the whole system more resilient.
(Honestly I don't know why supply chain people don't talk to networking people and consider multipath, bufferbloat, and the like. The finance people wicked down those supply chains and have resulted in too many single points of failure.)
Europe is the largest affluent market outside US. They’ve considered purchasing tech from China, they’considered taxing internet tech companies based on revenue instead of profit, and each time US convinced them not to.
The US doesn't get that benefit as the self-employed enforcer, and I'm sure we're all aware of how insanely massive the defense budget is.
In real life though, it's never that simple. Those destroyers and bases are being used for something even if it's stupid, and if they are no longer there, then things may change in unexpected ways.