No, this isn't an issue where maybe one way is better than the other or vice versa. If the police perceive a deadly threat (disregarding orders and perceived to be reaching for a weapon) and respond by shooting that person in the legs, they are not ending the threat. Criminals don't shoot you with their legs, they shoot you with their hands. Had this guy been pulling a gun, shooting him in the legs allows him the opportunity to continue to draw his weapon and fire shots at the officers.
Potaytoh, Potahtoh, but you are entitled to your opinion.
No, this isn't an issue where maybe one way is better than the other or vice versa. If the police perceive a deadly threat (disregarding orders and perceived to be reaching for a weapon) and respond by shooting that person in the legs, they are not ending the threat. Criminals don't shoot you with their legs, they shoot you with their hands. Had this guy been pulling a gun, shooting him in the legs allows him the opportunity to continue to draw his weapon and fire shots at the officers.