In any case, while deliberately setting a fire to a structure where a fugitive is holed up may make sense tactically, I seriously doubt that it’s an officially-approved tactic. Probably not specifically prohibited, because after all it’s not something that comes up very much. But deliberately destroying property seems like it wouldn’t be looked on as a good thing, normally.
I can’t escape the feeling that there was an unspoken agreement that Dorner was never going to be taken alive.