Spend some time on patrol with a police officer and you might understand the situation better. There is no other profession, even being in the military, that puts people at personal risk as much as law enforcement. It's an everyday thing.
Not saying that the shooting was justified, but I do understand both sides of the equation. I help train police officers, from cadets to personal protection details, and have learned a lot about police tactics. It's been a real eye-opener, and I realize that while such a response may seem excessive to most civilians; the reaction was one of personal survival more than anything. Hesitation will get you killed in that line of work faster than anything, and there is a mantra in law enforcement that goes "action before reaction."
I am also not saying the civilian's move to his vehicle should have been cause for the shooting, but it was sudden and just exactly how was the officer suppose to know he was going for his license and not a weapon? Trust me, there have been numerous examples of the latter, as some of the videos posted have shown.
Cops are people too, people who want to go home to their families and children at the end of their shifts the same way we in the military want to go home after a deployment. They also make honest mistakes, like many in the military have done; but not for nefarious reasons. I think that is the case here, and as sad as it is; such incidents occur and will continue to occur on a regular basis.
I strongly advise everyone to think about their actions during a police stop, I doubt the civilian who was shot every considered that such a drastic move could be interpreted as a threat but from the officer's perspective it was. It is like one aspect of having a concealed carry license, the law in Texas states that CHL holders have to inform a police officer that they are carrying if asked for ID; but one thing several officers have suggested to me was never to use the word "gun" because that is what officers are trained to yell when they discover a firearm. If a second officer is present, and hears that word; he/she may not realize who said it and react as if it was a warning. I was actually pulled over for speeding in the Jeep (as ridiculous of a concept that is!) a few weeks ago and I simply told the constable I was carrying when I handed him my CHL. I also had my hands on the steering wheel and made no sudden moves during the stop (I did find it odd in the above video that the officer allowed the individual to exit his vehicle, that is not normal procedure). If it had been at night, I would have turned on the dome light as well. These are small things that make a bit difference, as an officer never knows what situation they are walking in to during a traffic stop; and if you honestly put yourselves in their shoes you might understand why they are so defensive to such sudden actions by people!