Really? Guess what, no gun has any stopping power unless you damage a vital organ. Nope, not even the 45, 10mm, 44 mag, 50bmg, 22lr, or 17hmr can stop someone without damaging a vital organ. In the real world, shooting someone is far different than in a video game.sounds better than it is. it doesn't have much for stopping power, especially if you miss a vital organ.
In real life, a 45 or a 9mm has a decent chance of penetrating the chest cavity to strike the vitals, they are made to deliver projectiles of sufficient heft, and speed balanced out to be controllable. The 5.7, is designed to penetrate with velocity moreso than projectile weight. It is made to cleanly penetrate an initial strike zone such as an arm bone, or chest cavity, and it will go fast enough to fragment if it slows down fast enough, otherwise it will pass through. Its a nasty little thing to get hit with, and it can turn mediocre cover into concealment unlike slower heavier pistol rounds. Couple this with the fact it has about 1/3rd less recoil than a 9mm in the same frame, and twice the capacity, the 5.7 is nothing to sneeze at.
It has worthy appeal in a civilian market.