We helped stop Hitler and the aggressive powers in WW II. That was necessary and honorable.
But only after US colonies in the Pacific were attacked by Japan.
I'll point out that the "democratic" nations the US allied with controlled vast undemocratic colonies in the world -- I suspect that the majority of people under British or French rule had no say in how they were ruled).
But maybe I'll give this one to you anyway.
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Had we failed to stop Communism, what would have been the end result?
First, the U.S. did not stop Communism. Second, it's debatable whether Communism was really such a grave threat that it needed to be stopped.
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Now, with Islam spreading throughout the world, what would you have us do?
Huh? What are you talking about?
You can observe a lot by watching. -- Yogi Berra