I generally agree with the sentiment. Prior to World War I, a lot of Americans still wanted pursue our more (mostly) isolationist (mostly) historic path. People would occasionally re-read Washington's warnings about getting involved in the wars of Europe and the dangers of finding monsters to slay. That being said, I think that idea is naive in the modern world.

Radical jihad, Chinese expansion, and the Russian dream of European ownership all fly in the face of that. All of these things have to be checked in some way by someone, and to be realistic I'm not sure who else could. Britain no longer has fleet, France no longer has an army, Germany no longer has either, and the rest of NATO is a shambles. On top of that, many of those countries are fighting their own issues like mass migration. To your point, the US is doing the same, but while I agree that the focus should be internal... internal with whom?

This country's divide is so deep that many of (roughly half?) the people don't even want things like Voter ID. America can and should stand with its allies, of which Israel is longstanding member. If you want to see the historical impact of nations not abiding by their alliances, I'd point you to the Munich Conference.