That's a fair point, in a sense. But I think it's just a semantic thing. Here:

I assume that people under extreme stress (such as being in a gunfight or facing the possibility that your child was murdered) may behave in ways that seem irrational.

They will not always do the things you think you would do under those circumstances, because the brain does weird stuff when subjected to survival pressures.

A woman I did martial arts with was a black belt, and an excellent fighter. She was raped largely without a fight, because her brain shut down from the shock. She could have killed her attacker with her bare hands, but you never know how you're going to react under that kind of pressure until you're in it.

So, essentially, I try not to do Monday Morning Quarterbacking on what a "reasonable" person would have done under circumstances that could potentially make ANYONE unreasonable.