If he's to arrested, takes out a gun and threatens the life of policemen then, while he's at a dead end, it's obviously better to kill him than having some policemen to die... but the scene in the video only shows a guy robbing a bike, nothing more. He could have taken a knife to threat the guy as well and most people would be clever enough to give up the bike.
Deaths should be avoided, but not at all costs. As I said before that officer shouldn't have taken out his gun in the first place. But as we already disagree at that point, why bother going on more?
Video shows a robbery, your post is 1 a top, a criminal defending himself with a gun. If he uses it, his own fault.