On the 80th anniversary of the start of WW2, what are the important lessons to be learned and misconceptions that need to be addressed about it?

Before the bloodiest conflict in human history slips from living memory?
On the 80th anniversary of the start of WW2, what are the important lessons to be learned and misconceptions that need to be addressed about it?
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Apparently a lot of people have fallen for Crowders' "the Nazis were on the left" BS.
On the 80th anniversary of the start of WW2, what are the important lessons to be learned and misconceptions that need to be addressed about it?
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