“Point a .22 at me and I’ll leave the premises.”
I read a stat somewhere (may have been from John Lott’s book) that more people are killed by .22 than all other calibers combined.
The “9mm isn’t a large enough caliber” is simply a myth.
I am convinced that the key to 9mm effectiveness is quality ammo. The high capacity of most service models (4”+ barrels) has led some to sacrifice training and accuracy for volume. That is always a mistake. Practice. Have a plan for each situation. Never get complacent. Make certain you have thought through the consequences. And walk away whenever you can - I can’t stress that enough. Anyone who truly loves firearms respects the enormous responsibility that comes with carrying them.