I think that's an understandable point of view but, frankly, one of the key points of training (military experience only, but I know police do similar) is to force people to learn how to think and act correctly in high stress situations. If you're in direct engagement with someone trying to hurt you, you do let the training take over. But if you're just scared, or nervous, or some kind of emotional, the point of high stress training is to teach how to remain calm, controlled, and analyze the situation. Civilians may not get that, having not gone through it, but that really is the point.
> I took a class on active shooter scenarios where they focused on that "be careful how you train" aspect with the illustration that a police officer ( no idea where ) once responded to a call where an armed man pointed a pistol right at the cop close range. The cop quickly disarmed the man, but then returned the firearm to the man, whereupon the man shot him dead.
To me, this screams of a notional anecdote to reinforce the idea to train properly, not of an actual occurrence.