I came across this quote today.
"While there is some concern of overpenetration with a handgun cartridge, your primary concern should be that your defensive round of choice will have sufficient penetration to reach vital organs and cause incapacitating blood loss in an attacker."
On the surface the statement is clearly logical enough, provided we remove one aspect of it.
"... your primary concern should be ...."
Lest you ever find yourself in a lethal use of force encounter...or potential lethal use of force encounter, sufficient penetration of your ammo is far from the primary concern.
Your primary concern is to make sure that what you are seeing is in fact accurate, ala use exemplary judgement.
And I mean it. THAT is your primary concern.
"Hold on a minute" you're thinking.
"If I'm startled from my sleep in the middle of the night to someone breaking into my house I need to win that fight short and quick.".
Of which I would concur with you. However, you still need to confirm that what you believe to be happening is in fact happening. Don't misinterpret what I am saying, you can in most instances come to the conclussion that you need to apply the lethal use of force very very quickly. In some cases a mere blink of an eye.
However, time and time again we allow preconceived scenarios other people have laid out for us to become our future predictors. There is a distinct difference between sitting at a red light and seeing pistol pressed against the driver's side window and, sitting in an outdoor cafe somewhere and hearing gun fire, followed by a guy with a handgun running in your direction.
Gun does not always equal threat.