The Scottish Poet Robert (Bobby) Burns said it in plain simple English: "It takes no brains, no genius to criticize."

"Pedants will be able to cite exceptions, and thus undermine useful (insightful) theory. Their depredations must be firmly resisted by one simple test: does the theory generally aid understanding of useful military problems? If so, then exceptions are permissible."
J.P. Storr “Human Aspects of Command”