From my reading, mcherm is giving a hypothetical scenario in which the automatic response of sending a SWAT team would be unreasonable. The conclusion isn't that we exist in that hypothetical scenario, but that more information is needed in order to determine whether and how close we may be to it.
It’s a really hard job where you have to walk the correct route through a protocol in an emergency, often while being in danger yourself
The "protocol" for police is also dictated by their unions and the way laws around police use of force are interpreted. In general they know they are safe if they simply kill a person as soon as they perceive a threat. They will be legally covered and physically out of harm's way. This therefore incentivizes them to use lethal force, because they have no incentive not to use lethal force.
Yes, police have a hard job. But it could be a lot less hard (for them) if laws and policies are reformed.
I'm not arguing for 90%, just against assumptions.