Yes you foolishly hinted that the German Army of WWI and WWII was incompetent and that their choice of the 9mm was evidence of that.
Of course the German Army typically inflicted far more casualties on their enemies than the received so I did not think it a very good argument.
I know very little of combat tactics etc. but I do know guns.
The 9mm Parabellum was formed from the 7,65mm Parabellum caliber turned out to be too anemic to kill horses, among other things. The just blew the neck out to 9mm and jammed a 115gr slug into it and Voila, a new pistol caliber. Conversely, the Thompson-Lagarde ballistic tests refined and produced the ubiquitous .45 which has proven to be as effective as the tests promised. I have served in combat and have seen men shot with the .45 and all of them died. Conversely, I knew a man who survived Normandy with five 9mm hits to his lower body. I dated his daughter under his ferocious glare many years later.
War is about killing people, first shot if you can because the next shot will be the enemy's. It's not an academic exercise and it's not supposed to be skewed to favor weaker folks.
When you're fighting for your life and the lives of the men around you, you need effectiveness, not a compromise.