[OneWingedShark]

If you were to shoot at a uniformed police officer, what would you expect in return?

Well, that depends; just because he's a uniformed officer doesn't mean he's a good-guy.
Do you remember the Indian woodcarver who was shot and killed by a police officer (OR or WA, I don't remember exactly) a while back? The guy just walked past the car, the officer got out ran around the front, and killed him... given that situation, would it be murder for an armed citizen to pull out his weapon and kill the police officer? After all, he'd just seen the officer mow down some guy who was minding his own business.

[null and void]

Yes. Because the presumption would be that the officer recognized a dangerous subject, one who was known to pose an immediate threat to all and sundry.

And that officer should be subject to immediate disarming and detention and suspension pending investigation.

And he had better have a VERY good reason for shooting first without any attempt to resolve the situation less aggressively, like he physically saw that the guy was wearing a bomb vest or something else equally clear.

[Alaska Wolf]

Well, that depends; just because he's a uniformed officer doesn't mean he's a good-guy.

Do you believe Dorner asked the 34 year old officer, father of two young girls, prior to killing him?

Do you remember the Indian woodcarver

Yes, are you claiming he gave Dorner permission to go on a killing spree?