They are trained to shoot first without hesitation.
Actually, no. They're not (at least, not at any agency that I am aware of).
Follow commands and this doesn't happen. The kid made a dumb mistake. Well, a couple of them. He had a toy gun with the orange scratched off, which makes it look VERY real. Then, he placed it in his waistband once cops arrive. Then, when told to put his hands up, he goes for the gun in his waistband.
At what point is a cop justified to shoot in this case?
As far as the "going for your license" deal, I assume you mean the case in SC a month or so ago. That was a case of the cop being dumb, but the shooting itself is somewhat understandable (even though the cop sort of set the poor guy up for failure with his terrible command-giving).
Cops often DON'T shoot when they SHOULD shoot. I can provide a lot of dashcam footage from youtube that proves this. It's not easy for any sane person, even cops, to take a life. A lot freeze up and get killed for it.