Exactly the point I was trying to make with my story about the CEO's family - people react differently to situations, based on their temperaments and past experiences. It's easy to set a hard and fast rule in your policy and as you train, and much harder to follow that rule when common sense and someone's safety and maybe life tell you to do otherwise.
I think the best we can do is give people good solid training, and understand that the 'standing rule' to not trip the alarm until it's safe, or the perp is out of the bank, or whatever, may need to be modified in certain situations. Then you hope that the person modifying is making a rational decision!
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Opinions my own.