Was isolationism by the US justified why or why not?

Isolationism in the U.S. was justified by the desire to avoid the costs and consequences of foreign conflicts, especially after the devastation of World War I. Many Americans believed that focusing on domestic issues would better serve the nation's interests. However, critics argue that this stance allowed totalitarian regimes to rise unchecked, ultimately leading to World War II, suggesting that proactive engagement might have been more beneficial. Thus, while isolationism had its rationale, its long-term consequences questioned its effectiveness.