This is not about "cowards and incompetents" - it never was.
It is about the ruthlessness of the war; the fact that millions of men were expendable for the cause of empire and that yards of useless territory were won at the cost of human lives.
The incompetence of clowns like Kitchener and the indifference to human life were covered fully in the Paxman series by the 'wrong shells' fiasco and by Passchendaele.
The reasons for joining were also fully covered by Paxman - these have never bee in doubt - whatever Ms. Pennell's opinions might be (no evidence so far to the contrary - though you still refuse to respond to your "liars" accusation.
Jim Carroll