I'd say being able to hit an intended target and not just praying and spraying is part of firearm safety. Errant bullets can cause a lot of damage. It's been over a decade since I've owned a firearm but it wasn't for nothing that one of the four fundamental rules of firearm safety I was taught is "be sure of your target and what's behind it".
in the firearm safety course, you learn not to shoot if there's anything behind the target you do not intend to destroy. Even if you hit the target, the bullet can pass through it. So it really makes no difference for gun safety whether you hit.
5.7 is known to be pretty terrible for its "stopping power" for lack of a better term. Its a handgun round design to penetrate body armor. In doing so it had to make sacrifices in bullet dimensions and weight. It performs similarly to a .22 magnum round which is a frankly wimpy cartridge meant for small game like rabbits.
So 20 rounds to stop a human isn't stretching the truth too much.
Depends on what you’re defending against! Only people wearing kevlar body armor are cops, militants, and ice hockey goalies. I don’t know much about guns, but from the description you’re replying to this sounds like the right one for personal defense against wannabe fascist militias and overfunded/overarmed police forces. I agree it’s the wrong gun to defend against the defenseless, but shooting the defenseless is not what I think of when someone says “personal defense”.
Its a good gun to carry if you are worried about a spike of mall shooters in your area. Many of the incel mall shooter types commit their shootings in some sort of basic body armor. The 5.7 round would be better in that one case.
Still, just about everyone would be better off just getting a good reliable 9mm pistol of some sort.
In high stress situations people frequently don't even realize they got shot until after the adrenaline wears off. In my EMR course they trained us that we need to physically check for bullet wounds ourselves if a shooting was suspected because you can't rely on the victim knowing that they've been shot.
That's why mag dumping is more or less standard practice in survival situations. Sure, 1 bullet may kill the person, but it probably won't do so for several minutes and until then you've only pissed them off. So you shoot and keep shooting until they actually drop. Which, when you're talking about a particularly wimpy round like the one above, can take far more bullets that most people expect.
I did not know that (I probably should have figured it out though based on the physics and the tiny little bullet) when I professed my love for the PS90...I just thought it was fun at a range... And now I learned I might as well been shooting a money gun.