I think we can understand WW2 in fact more so now than ever before because we can study the war without the emotion an bias of having experienced it.
We can separate the propaganda that both sides propagated and look at the bare facts.
Can we understand the emotion and feeling of being there, no we cant but these days we dont need to because it is over and often leads to bias views anyway an example of this is the Italian campaign, my father and two uncles fought there and as a kid I listened intently to their stories.
Then a few years ago I discovered my wife's maternal grandfather also fought there with the US army and oddly enough her paternal grandfather served in the German army in Italy as well.
So for 70+ years there were five different views of the Italian campaign by five different veterans of the campaign and all of them were different, it took 70 years for those views to be collated into one view and what I learned was that all of them were accurate but they were only small snapshots of events as they happened, 5 pieces of a 1,000,000 piece puzzle.
These days we have access to hundreds of thousands of bits of the puzzle from all sides that we can analyse dispassionately and honestly and we should do it however I feel that many of us analyse data and then try to make it fit the propaganda we have had drummed into us since WW2.