The US strikes in its own interest. Why does the USA have all these military bases all over the world? The worldwide deployments? To help others?

You wrote:
"We did not want our military employments dictated by foreign generals."

Exactly. It is about the US influence in the world - not helping others.

What would it mean if e.g. Europe "takes more responsibility"? Less US influence. It would be European governments and generals who decide. It would be not that way that increased European military spending would go to the US military. It goes to European military (most European states recently doubled their military spending). The same if Saudi-Arabia would be able to handle that on its own. It would mean less US influence and more Saudi-Arabian influence.

Isolationism and super-power status at the same time is not working.

If "make America great again" is isolationism, it would make America in regard to international politics small again.

Look at what happened to British influence after it lost its colonies and withdrew from its forward bases. Its influence was massively reduced, it became a normal country like its neighbours.

The Royal Navy also fought to support world trade - in British interests, to maintain British influence, British shipping, etc.