Man, in this sort of situation, if you know that you aren't going to knock, you reeeeeally better make damned sure that you have all the details straight before plowing through the door.
Unlike Maine, I don't own a handgun or rifle of any kind, but if I am awakened in the middle of the night by someone "wrongfully" breaking through my door downstairs, I can guarantee you that I'll have a brace of stingers (3" throwing knives) strapped on and will try to drop a couple of the intruders as they come up the stairs. If they identify themselves as police or swat, then I'll show restraint, but if they don't ID themselves clearly at the start of the situation, I'm definitely coming out throwing.
My point exactly. With all the resources available to LEO's to confirm the identity of suspects and to ensure the right domicile is being targeted, there is no excuse for the murder of an innocent person in a raid. Immunity should go out the window at that point. I had sticter rules of engagement when dealing with possible vbied's and suicide bombers at the checkpoints I ran in Afghanistan than some officers do in this country. I had to make sure there was no doubt it was a hostile before I or my soldiers opened fire, and I had to justify any shooting that took place or face serious consequences.