The problem what you are suggesting isn't showing a value of life, at all.
You maybe right that police policies need to change, something probably does with all we've seen lately, but shooting limbs and firing warning shots are not the right changes.
People have died from others doing stupid things like firing guns in the air on New Year's day, just recently we had the story of the father that jumped after being burned by a shell and fired a shot that bounced back and killed his son.