I do not believe that Mr. Hurley "sacrificed" himself. From the information we have available, he saw the murder of the officer take place, decided to do the right thing, and shot the bad guy. This was the right thing to do, and if we're taking Arvada PD's word for it, likely prevented further violence against police officers. What then apparently happened was that Mr. Hurley picked up the suspect's rifle or was otherwise armed when a responding officer showed up and shot Mr. Hurley, killing him.
This is absolutely a tragedy. We don't know what the officer saw nor what went through their head, but the end result is that a police officer shot the good guy after the good guy shot the bad guy, after the bad guy shot a cop. That is a terrible outcome all around.
I think framing it as a sacrifice is incorrect. The man put his life on the line against a murderous scumbag in defense of his fellow man, and triumphed over the murderer. Had he died in that endeavor, sure. Instead, he was negligently shot by a third party, who was also trying to do the right thing themselves, though as a trained agent of the state. Framing it as a sacrifice inspires an image of a firefighter perishing trying to save someone in a burning building, something noble that could not be prevented, and the cost of doing the right thing. It also makes it problematic to question the factors involved for risk of cheapening the sacrifice.
I've got no issue calling out bad police shootings, of which there have been many, but I can absolutely see this playing out as a tragic mistake by a scared and amped up police officer responding to a call of an officer down, one that should not have happened, and should be prevented from happening again, but not one that should have the police officer on the inside of a cell or anything like that. On Mr. Hurley's side, it brings up the classic question of is your CCW to get you and yours to safety, or to stop an act of evil occurring? It certainly reinforces the idea that you should absolutely not be visibly armed around the police, how differently would this have gone if Mr. Hurley had holstered his pistol, not picked up the rifle, and turned himself in calmly with his hands up to one of the responding officers after the scene was secured?
I think these are all valid discussions for a forum on this topic, and also acknowledge that by using his carry piece in this manner at all, Mr. Hurley was already waaaaay statistically unlucky, and even moreso with the tragic way his life ended. I truly believe he did the right thing and likely prevented further loss of life. I also believe his death should have some value in the tragedy by being a teachable moment to both carriers and cops, Mr. Hurley died tragically after putting his life on the line to try and save the lives of his fellow men, and I'd like to think that using the information gleaned from this tragedy to save the lives of others would be in that spirit.