I guess we are each entitled to our own opinions. I don't believe for one second he didn't know it was the cops.
And I've said it before, but to elaborate, he did not do what I would have done, nor what I believe the law allows (again, my legal evaluation is based on a general Castle Doctrine most states employ). Generally speaking, a person is presumed to have acted in self defense if they use deadly force against a person unlawfully trespassing or attempting to trespass in their home. This means there is no duty to retreat, and the defendant gets a presumption the trespasser was there to cause serious physical harm or death. But that presumption is rebuttable. In this case the officers yelled that it was the cops several times and loudly, had moved through the house while yelling it was the cops. The suspect and his girlfriend both admitted to hearing them both at the door and in the kitchen saying they were cops. This fact alone rebuts the presumption that the person gets. This then shifts the burden back to the defendant to prove he acted in self defense. This is why I say taking a shot through the door (and no, FatAlbert, I don't believe the facts are that he shot through a hole where he could identify the target) is not only a bad idea, but his downfall. If he can't identify the target, he has no way to counter the fact that the officers were there lawfully and that he was on notice that they were officers. Yes, I understand the argument that criminals can falsely claim to be police. All that does is means we need to make sure we identify the intruder as an unlawful intruder before pulling the trigger. We should still be on alert, but must wait that split second before shooting. He didn't, and he is now facing a murder charge.
Let me pose this hypothetical: What if it was a family member stopping in from out of town for a surprise visit? That person has been in the house before and you are of such a relationship that you allow them to come into your house without knocking. This time you awake to find a noise coming from your kitchen so you go there in the dark. Without turning on the light to identify them you shoot them in the dark. In nearly all states, that scenario results in criminal charges and losing the presumption of self defense. All because they didn't identify their target. And like this scenario, if it was a bad guy, taking the time to identify the target might put the person in an even tougher position if it did end up being a home invasion. But likewise, it is still the person's responsibility to identify their target.
It will never be my position or my advice to pull the trigger on a gun without first identifying your target. No exceptions. ESPECIALLY when that target has already identified themselves as not being a threat. You have a heightened responsibility in that instance to find out if they are a threat or not.
We as gun owners need to hold ourselves to a higher standard. We possess deadly force. We need to follow strict rules that prevent that deadly force from being used on innocent people. Plus, we need to make sure that in today's world, we counter the claims of the gun grabbers that we are all paranoid nuts just itching for a reason to shoot someone. Shooting those identified as police through a door does not help that situation. It makes all of us look bad and is a violation of basic gun safety.