Knowledge, or at least understanding, doesn't always move on, sometimes things which were quite well understood are clouded by more recent, flawed, research, or, by flawed opinions based upon preconceptions and political positions. Or maybe even by personal self-justification. As to whether Haig or Lloyd George was the more culpable for the disaster of the Somme, well thats a futile argument between a pot and a kettle. Though LLoyd George was in part responsible for the entry of Britain into the war in the first place.