So, wouldn't be ok to shoot people like this if a gun was in you're hand? I would imagine it would be OK as long as the bullet doesn't enter their back. Pretty lame ting to rob like this. Time to start controlling the home invasion criminal population.
Interesting thing about BG's getting hit in the back.
We discuss this in one of our classes when talking about the OODA Loop. That time that you subconsciously take to Observe/Orient/Decide/Act in just about everything you do. It's a continuous process.
Heavily condensed version:
In two studies, (Tempe Study and Blair with 24 SWAT Officers) they timed various actions/reactions to determine how long it took to fire, draw, stop, etc. of course none of these numbers are carved in stone, each individual is different, but the studies showed some consistent averages:
Avg time for the cognitive brain to Observe & Orient - .4 -.5 sec
Avg time to draw and fire 1 rd on target from concealment 3-7 yds - 1.5 sec
BLAIR
Avg time for BG with gun at side, facing officer with gun drawn, to initiate and get shot off on Officer - .38 sec
Avg time for Officer with gun drawn to react and pull the trigger once he noticed movement of BG gun - .39 sec
TEMPE
Avg time to fire with finger already on the trigger when they saw a green "go" light - .3-.4 sec
Avg time to STOP pressing the trigger after they had decided to - .5 - .6 sec
Avg time to quickly turn ones shoulders/upper body away - .2 -.3 sec
Think about that

Action beats reaction almost every time.