You can destroy your opponent’s heart or lungs, but putting one in the CPU stops everything. A good head shot stops the central nervous system cold. No time for a trigger finger twitch to shoot the hostage, just a total body collapse. When I went though the academy they were teaching shooting to the pelvis. I have seldom seen it taught in the last 10+ years. If you want to stop the threat, then git ‘er done!!
Here’s a link to Gabe Suarez’s blog on the subject. Read it.