This is a human life we're talking about. He was unarmed. Why didn't they just talk to him? 
So why don't you explain why, if you are unarmed and see police pointing gun at you, why don't you just surrender? Why it isn't even an option for these guys, why do they always want to fight with the police who have a gun? More than 600 dead in this year already, this doesn't tell anything to these guys about the police way to use guns? Who you should blame? Police who acts by his rights, or imbecile who want to fight with an armed police?
And if this bozo would have the gun from the police, what next? There would be 1-2 dead police + whom ever that bozo want to kill, like bus driver, 12 by standers, next police who arrive to scene etc. Would it have been better?