To defend in part America’s isolationist attitude, recall that for much of its history the majority of Americans did not want a major part in international affairs. Before WWI and WWII, most Americans hoped the political problems in Europe would stay across the ocean.
So while the French, English, Dutch, Russians, and Japanese maintained and expanded huge colonial empires, swallowing whole countries by military force, maintaining vast fleets and armies, the United States concentrated on her internal economy.
When we finally entered WWII, it wasn’t with the idea of becoming a superpower. It was to protect our European friends, and to fight off Japanese and German attacks on our soil and shipping.
It makes a certain amount of sense, then, that the United States did not train its citizens in the wiles of confronting and subduing other cultures: its plan was to let them govern for themselves, and forward their own interests, as necessary. Instead, we’re in a situation where the colonial systems abruptly collapsed, leaving a vacuum that was filled by a country with great resources, that happened to have won the last World War and the Cold War. Now, ex-colonial powers and ex-colonies can’t understand why Americans don’t have the savvy created by hundreds of years of exploitation and occupation.
We don’t have all those organizations, institutions, and laws supporting hundreds of years of civilian and military occupation abroad. Unfortunately for everyone concerned, it also means there’s no convenient, ready, natural way for millions of Americans to be able to closely empathize with every nation where a need arises. Even the British and French didn’t have to relate with the people and cultures of every single country in the world. We’re not trying to take over the Middle East, or China, or Canada. But no one will let us permanently and completely walk away, either. So cut us some slack.