I see you are an expert. Don't you think you could hit a guy in the legs at 10ft? Or would it be better to aim for the groin?
I am definitely not an expert, but if I can't hit a pop can at 10ft, I might as well get rid of my gun.
Its not about being able to hit a pop can at ten feet. When you have to draw, and are in fear for your life, you not exactly at the range all calm and collected, it just got serious, your blood is pumping, your stress level is on high, and your about to pull the trigger in someone's direction, knowing what's about to happen to them.
And your not exactly closing one eye and taking aim for his legs, because if you are your situational awareness just went down the drain, and you can no longer see the rest of him, what his hands are doing, what his body language is.
Aim center of mass if your going to pull the trigger, Much larger target, You can see what the rest of him is doing while staying on target, And if you shoot him in the leg, He's going to sue you, You're right, he may not win, but he has a side to the story now. A one sided, truthful, story is much easier to tell the police.