So what happened to innocent to proved guilty ? Are we just going to shoot anyonewho is a criminal ? The officer was amming at his head with the saftey off, he pulled the trigger for some reason. I dont think murder should be the charge but there has to be consequence.
I think you are approaching this from a normal policing point of view, the issue in this case is the extremely significant 'firearms' element.
This immediately means they have to assume that the driver is armed, which requires an armed response to deal with, which means the swift decisive stop, the immediate guns trained on them with safeties off. This has to be the case, having guns on immediately ready to shoot is the best action, any delay from the officers end, and either they or a member of public could be harmed.. the moment a gun is seen, they will probably open fire.. they can't wait for them to shoot first, then release their safety, then respond, it's too late and they certainly don't want to softly approach, give them oodles of time to get a gun and start shooting, that's even more dangerous.
And we do have 'witness' reports (as per the Metro article I linked earlier) that paint a pretty solid picture of at least 12 verbal instructions to get out the car, followed by CK ramming the ARV and Tesla, then reversing and only then was he shot, so I'm assuming it was for his attempts to get away and the threat that posed.
This is also the angle I think is most likely (if I had to guess) where a Murder charge may be applied, because the moment it becomes a case of exactly how much imminent danger the officer may/may not have been in will be subjective, and also if there is an element of the officer was only in minor danger but did not want to let the guy ram and get through/disappear with a car that may have had firearms in it etc, then it's subjective as to if that was reasonable or not.. and the moment it's subjective then he's screwed, because public opinion which is stoked by media have already painted the picture they want.. zero mention of his recent conviction, why he was in that car, why was it flagged and only one article I've found had the witness account detailed that showed the actions the Police took prior.