I guess it comes down to this: Would YOU personally be comfortable with that controller on the line with you if YOU had a problem and needed something "unconventional"? This is not asking if YOU are capable of handling the "potential emergency" you are dealing with. This is asking if YOU are OK with needing something from THAT GUY and he's asleep at the switch and tells you that you can't do what you're planning on, or needing to be, doing?
Are YOU ok with that?
Yes, most definitely, the controlled doesn't control my flight, the controller controls the airspace. There was absolutely nothing, not even a suggestion in the AIM much less a rule in the FARs that prevented him from putting on his O2, pushing the yoke forward, chopping the power and taking a sled ride for 10'000' which is what I would have done. As I was pushing forward and chopping the power, I would hit the PTT and TELL ATC, not ask, TELL them that "(xxx Center, 0TB, I have a pressure problem and am heading for 10,000."
You point out the problem, he didn't ask for anything unconventional, he asked for something conventional, a lower altitude. He said he had "a bad indication", that does not indicate an emergency, so the controller used the normal methods of protecting the airspace to get him lower.
If you ask for lower, they will assure the airspace is coordinated for you being lower prior to issuing the new clearance, that is their job. If you declare an emergency and head for lower, then they will shove everybody out of your way as you're coming. The PIC owns two three links in the accident chain. He didn't recognize/treat a problem for what it was, he did not don his O2, he did not declare an emergency and descend. Their death is of his doing as he could have prevented them.
As for your gun training, all you do is teach scared people that gun violence is the answer to their weakness and fear. Comparing that to anything like ATC is completely idiotic.
In comparison to what you say about the ATC handling of this is like saying someone armed needs permission from the Police before they can shoot, and while standing there with Gun in hand on the phone with 911, they were shot by their assailant waiting for permission, so it's the cop's fault.