The "account" is nothing more than the word of someone who killed another human being. He benefits greatly by making certain that his "account" clears him. Apparantly that's enough for the factually challanged, unscientific types.
OK, let's wait until the full investigation is completed. It's my opinion - assuming I'm allowed to have one - the conclusion will be the same. This officer fought back against someone who was armed and attempted to shoot him. The officer lived, his adversary didn't. I'll give this officer the benefit of the doubt, but it appears you won't.