Very intriguing point. I usually tend to be in the middle and it is a difficult question. In a revisionist sense, I question WWI and II and most of post war "entanglements" even though I served and would never hesitate to do it again.
After having seen Kaiser Wilhelm II express his desire for a “United States of Europe against America”, and the fact that Woodrow Wilson had to act in spite of his prior craven re-election slogan “He Kept Us Out Of War”, I can no longer see things any other way.
The leftist “American Committee on United Europe”, being themselves anti-American, certainly knew what kind of Frankestein monster they were reassembling after WWII.