Not to defend the cop, but a lot of the blame lies with the attitude and training that is being delivered....and it is with the departments and the "Law Enforcement" community at large. I quoted Law Enforcement even though I prefer the term Peace Officer, but that obviously does not apply here, nor does it apply where it ALWAYS should.
When you train officers to respond instantly to a perceived threat, even going so far as to use pictures of pregnant women as targets, what chance does a disheveled and disoriented male automobile accident victim have of surviving an encounter with "Law Enforcement" responding to a 911 call generated by said victim knocking on doors looking for help?
The victim matched the description given in the 911 call, of course, approached the "Law Enforcement" officers looking for help, having assumed they were Peace Officers. One "Law Enforcement" Officer, saw the victim, perceived a threat and instantly shot, killed and eliminated the threat....just as the "Law Enforcement" culture espouses.
This type of event happens often enough that citizens are not off the mark in considering any encounter with "Law Enforcement" as a potential deadly threat. Indeed many do have a dread and fear of any such encounter.
Should we start to train ourselves to respond instantly to any perceived threat, perhaps using pictures of "Law Enforcement" officers as targets?
Of course not...but this holds much more true of the Police...and, yes, I do believe the Police should be held to higher standards than civilians.
For instance, in the same threatening encounter, if the cause of the threat pulls a squirt gun or any firearm look alike, and points it at the civilian or Peace Officer, I'd say both have a valid reason to feel they are faced with an immediate and deadly threat.
If however, in that same situation, the threat pulls "something" from their pocket and "points" it at the civilian or Peace Officer,
I say the Peace Officer has a greater responsibility than the civilian to verify the object is a real threat.
While the civilian might have a moral obligation to be as sure as possible it is a threat, it is the Peace Officers job to do so.
I see this as a very fine distinction, but the Peace Officers responsibility for making the correct call falls just ahead of the civilians, or close enough to be equal, but, for sure, not less than the civilians.