While I have not had time to go forth onto the web and read the reports about this incident, from what I've seen here, there still appears to be alot that remains unknown. Were there hostages? Was Dorner firing at officers? Has it been confirmed that Dorner was even in the building? Even if he was, I'm unaware of any tactical response protocol that includes burning down a building around a suspect.
While I understand the officers' urge to "get" Dorner, it's undisputed that he had not faced a trial of a jury of his peers. I have very, very grave reservations about police carrying out summary executions.
I will also caution everyone posting in this thread to avoid getting caught up in some of the bloodlust surrouding this event in their postings.
I'm a lawyer, but I'm not your lawyer. If you need some honest-to-goodness legal advice, go buy some.