The reporting this morning (terrible as it was) says the guy WAS tazed before he was shot. If so, that makes the case of the police even stronger.
If he was trying to open the car door, and the tazer didn't stop him, then shooting was the only remaining alternative. They could NOT allow him to open that door.
On the other hand, if he was shot after he was already down, it shouldn’t go well for the cop that pulled the trigger.