Just a few more points to consider....
You can find examples of where everything has worked, and examples where everything has failed. From the .22 short to the .50BMG.
If you "keep going back" to the kid who shot himself in the heart, didn't die, and consider it a caliber failure, you are fixating on the wrong thing.
How about the guy who shot himself in the head with a .44 Magnum BLANK, and died??
How about the 9mm in the Miami shootout, that passed every test, met or exceeded every requirement, worked in numerous other shootings, but "failed" (according to the FBI after action critique) in that ONE real world situation??
How about we stop using the logic train that goes "Snow White ate a poison apple, therefore all apples are poisonous, therefore no one should eat an apple, ever!"
If there is a failure to stop, its NEVER the caliber that fails. it's the SHOT. And the shooter.
Firepower matters, in an infantry assault...Round capacity matters, if you miss. And we all miss, sometimes. Sometimes its not our fault, sometimes, it is.
If you shoot the way TV teaches you, you'll need a lot of ammo! Action heroes shoot tons of ammo, provide their own cover fire, and almost never run out. They MAY be seen to reload their guns, but they never seem to run out of ammo...and, they tend to fire in "bursts", usually double or triples, when using semis.. and they never have hearing trouble shooting without protection, either...but that's TV...
And while it is TV/Movies, and we "know" its not real, it also IS a level of training. Below conscious level, but still a degree of training. BAD training, but still training. It's what people are likely to do, if they haven't been taught differently. And when they aren't able to take the time to think about it in advance of doing it.
You, or I, or the next guy might not need every round in the gun. Someone else, might. And another someone will use them all, need or not...
there are cases of guys doing tap, rack, bang failure drills thinking their gun jammed, when in fact they had shot to slide lock empty without realizing it.
Every shooting is different in many different ways, and the only real thing in common to all is that someone got shot.