Does this argument help your case about "national character"? It's clearly true that a naive anti-communist would do a terrible job of predicting the actions of the United States during the Cold War. That's an argument that anti-communism was not a part of the national character of the US.
But your position seems to require that national character have some predictive power in policy decisions. So what particular national character drove US actions in the Cold War? I personally think that national self-interest (i.e. Great Power politics) drove the Cold War, not ideology. But self-interest is an odd thing to label a "national characteristic" because it seems unlikely that there are nations that lack that quality.

To recap, this is the quote that started this sub-debate:

To the extent that there's a "national character" that affects policy, I feel it has primarily, perhaps even solely to do with concepts of self-identification similar in type to the concept of Clash of Civilizations by Huntington. e.g. Greece supported the Serbs in the Yugoslav wars for no more and no less reason than that its "national character" contained a self-identification with Eastern Orthodox significantly more than with Catholics or with Muslims. Now there's predictive power. In any dispute between orthodox and non-orthodox, I know that Greece will back the orthodox. I know that Arab nations will back the Palestinians against Israel. America in the Cold War self-identified as anti-communist, so in any dispute between people identifying as communists and people that didn't , I know America would back the people that didn't.

There's the extent that national character plays in regards to policy. If there's some other element in it with predictive power, I don't see it.

I don't see how disproving the highlighted portion shows that the following sentences are untrue.