Where the 9mm carbine falls short (in my opinion) is the inability to penetrate IIIA body armor. Maybe a few of the faster loads will do it, but not the common ball ammo.
It's one of those longshot circumstances, but if home invaders are wearing body armor, and more are these days, the 5.56 kind of wins in that situation.
If you're dogging the 9mm shortcomings based on whether the bad guys have armor, at least be honest with yourself because IIIA has been obsolete for at least two decades and most people have already switched over to better things. Your AR won't get through level IV either. Neither will 308 or shotguns.
