"whether something was written 20, 50 or 100 years ago has no bearing on its validity."

Really GUEST Dave??

So someone let's call him David Lloyd George decides to write a book in which he firmly attaches blame on an individual who having recently died is in no position to defend his good name. In this book David Lloyd George places the blame for the deaths of soldiers on this individual on account of him choosing the battlefield, the timing of the battle and for his continuation of the battle, David Lloyd George does this knowing that those facts will be covered by government restrictions until 50, 60, 70 or even 100 years have elapsed, David Lloyd George writes these things knowing full well that it was he, David Lloyd George, who put Great Britain's armies under the command and disposal of French Generals, that it was he David Lloyd George, who insiusted that in 1916 the attacks had to be made on the Somme instead of in Flanders where Haig wanted to attack and vice versa in 1917 when David Lloyd George insisted that the attacks should be made in Flanders when Haig wanted the attack to be launched on the Somme where conditions best suited the tanks. It was David Lloyd George who knew full well it would years after his death that his guilt and culpability in the events relating to the Somme and Passchendaele would come to light and become public knowledge.

Of course works written 20, 50, 70 years ago once proven to be based on incorrect knowledge or understanding are no longer relevant - only a complete and utter idiot would suggest otherwise.