Perhaps you'd volunteer as a test subject to prove that 9mm only makes folks irritable......
BTW, the reality is that plenty of people have been shot by 9mm, 40 S&W, .45 ACP and all other sorts of handgun cartridges and lived to tell about it. I've yet to see someone volunteer their body to prove that 9mm is wimpy and can be easily shrugged off.....
Any projectile .17" and up can be fatal upon humans when placed properly, which is the number one factor in regards to incapacitation. Shot placement is first, penetration second, expansion/diameter third - in that order of importance. A .22 LR shot that hits the central nervous system will have a much better result than a .45 ACP to the big toe......
Do you honestly believe that an extra .10" projectile or 100 ft/lbs energy is what really matters when your life is in the balance? He who hits first/most/most accurately wins....