I think a good deal of what led him to his actions in WW2 was there prior to WW1. There were plenty of those who suffered much more than CE did in WW1 (after all, he lost no close relatives, got most of his money back, still had some power and prestige and wasn't wounded) and they didn't become virulent Nazis. I think some of this rather denigrates those who went through the post-WW1 period with much more suffering yet at worst sat back and at best fought back against the Nazi regime.