There is no correct answer. The point is consider your own rules of engagement should the need arise. My own ROE’s are very similar to the author’s.
Armed robbery? I’ll be a good witness. He can have the money until the cops catch up with him. “Get in the car (for any reason, including “drive to an ATM”), the fight’s on.
An active shooter in a place where able-bodied adults are able to act for self-preservation, like say a crowded movie theater? I’m getting my people out safely, and will be a good witness for LE which is surely on its way.
A Newtown type of scenario? Well, that’s a different matter — people too young or otherwise unable to act in self preservation, well, my life will take a back seat. As long as my family’s safe, I’m calling it in, and then going in.
The point is, you can pre-game a lot of scenarios. The ones in which you avoid trouble, or can avoid contact with the enemy are more numerous, but some you have to decide in advance. You won’t have time in the heat of battle to make a thoughtful analysis.
Still, what’s right is up to every individual: your health, your weaponry, you skill at arms, the totality of the circumstances which are unique to you.
I disagree.
There's an old military saying: “No plan of battle survives contact with the enemy.”
As Mike Tyson said: “Everybody’s got a plan till they get hit in the face.”
I believe you won't know how you'll react until the time comes, no matter what your plan is.