This situation seems dumb all around...
For the cops; I can see the reason for not wanting to identify yourself when trying to catch a potentially dangerous person. I can also see the reason for defending yourself against a person with a gun pointed at you. I cannot see any reason to go in like this when you are not 100% sure who is going to be answering the door. Seriously, the suspects motorcycle was parked outside? The police couldnt confirm who the home owner was in advance? maybe see that there was no connection to the suspect? Really sloppy play on the police side of things, and in the end they should be held fully accountable. As a county mind you, the individual officer acted in self defence and should not be punished for this (I am certain he is going through issues of his own for shooting the wrong person)
For the victim; Why would you answer your door with a gun? I understand that it was 1:30 am, but who did he think it was? Did he really think a criminal would be knocking at his door? Why didn't he look through a window or something if he was suspicious of who was there? If he was really worried that someone was gonna come in and start trouble, why didn't he call the police? why did he even open the door?
It is a shame that the man died, but this whole situation has stupid written all over it.