Yup.
"Mistakes were made, BUT..."
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EDIT: Thinking back, my Dad actually had a a pretty effective intellectual defense of this uncomfortable fact...
...he'd say, "yes, what we believed was wrong, but the whole World was against us, so it was what we needed (to believe together) at the time to stay united as an organization..." (paraphrasing, but that's the gist).
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As a young guy, I had real trouble refuting that argument.