"The historians have done just that by studying thousands of letters, diaries and documents from the time.
Their findings are unequivocal that most believed in what they were doing."

Now I understand why you like them so much!

Just like you, they simply dismiss what doesn't fit their POV.

The first action of the whole pack was to rubbish the opinions of those war poets who catalogued the horror and futility.

How many of those "letters, diaries and documents" went the same way, I wonder? It would be very interesting to look into that, but of course it wouldn't be allowed.

Mustn't spoil the celebrations Old Sport!