^Watch the video. They went in, the pharmacist shot the unarmed one (which is stupid), the armed one ran away and the pharmacist chased him out. Then the pharmacist came back, checked on something, then walked over to the guy he'd shot and shot him 5 more times. That is murder, not self defense.
Also, just cause "that's the real world" don't mean it's ok to shoot someone over some shit like that. Morality and what really happens often don't correlate.
Killing someone over material objects is pretty cold blooded, yeah. Armed robbery isn't a small thing but it's a lot smaller then taking someone's life. Someone robs me, they get what I got and we both walk away alive. No one deserves to die just for robbery, that's not a fitting punishment.
As far as jail being like hell, jail isn't that bad. Prison though, prison is like hell, I wouldn't wish prison on anyone. And prison is where this guy's going.