Now I predict that once Dorner is killed (if he goes out by means of police gunfire) we're going to hear the "OMG they killed him to cover up secretz"
If you look into the history of the LAPD over the past two decades or so, there aren't "secrets" necessarily. Sure, people love a good conspiracy (let's just say, hypothetically of course, since nobody would believe this - government agents killed Aaron Swartz) - but the LAPD's misuse of authority and corruption is pretty well documented.
The past decades have shown a pretty remarkable turnaround - but that's evidence that either (a) the LAPD is doing much better in following procedural law and respecting citizens or (b) the LAPD is doing a much better job at covering up the fact that they have not changed their disregard for the law and treatment of citizens. Dorner clearly thinks it's (b). Historical precedent might also suggest (b) as well.
I'd like to see more police jurisdictions do away with "internal affairs" as their form of oversight, and have to deal with independent, external, transparent oversight agencies that have legal authority to sanction, fire, or charge officers who violate the law or abuse citizens. Internal affairs creates too great of an opportunity to cover up corruption, and citizens tend to be skeptical that they work at all.
At any rate, I'm appreciative that Dorner's message isn't lost with his despicable methods; it's too easy and alluring to fall back on "he's a lone nut with a gun" trope and ignore that it's very, very possible that his concerns about corruption in the LAPD are accurate. It's hard to separate a person's message from their actions - in this case, I dig that people are able to do that.
Make no mistake, however: he will be caught and killed, whether deservedly so or not (i.e., if he is caught and gives himself up easily, he'll still be killed on sight).