Actually, the simplest explanation is that you’re an idiot
Shorter Confederate Wankee: Occam’s Razor clearly tells us that the simplest explanation for this study is that a team of researchers devoted years toward earning respected positions in their fields; developing reliable and widely-used statistical methods; composing a study that applies those methods to a current conflict; and surreptitiously grooming peer-reviewers to approve a bogus, partisan article for publication in the world’s most prestigious medical journal . . . all to make the previously-unheard-of observation that the Iraq War has delivered catastrophic effects to the people of Iraq.