Bret4207, I agree that these are largely academic exercises but they are not completely pointless academic exercises.
The occurrence of the emergencies we speak of are extraordinarily rare. However, if the emergency occurs, there is no longer time to plan.
SO - we take advantage of that time that exists prior to the emergency and plan the best we can, when we can.
It is highly unlikely that you will be in a car accident but you may attach a seatbelt before the car moves. There will not be time to put the seatbelt on once the accident starts to occur.
It is highly unlikely that a commercial airliner will depressurize at high altitude but we equip those planes with emergency oxygen masks and provide a briefing before every flight.
It is highly unlikely that there will be a large fire in a school but we hold fire drills, have fire hoses, install fire extinguishers, label fire exits, etc.
Handguns are poor tools to stop a human attacker but we can't carry a rifle or shotgun all day, every day. So we compromise and select a handgun that can be carried and concealed. After that, we use that time before the potential emergency to plan. We use that time to stack the odds as much as possible in our favor: We avoid danger. We maintain situational awareness, We train with that tool.
We Attempt To Select Effective Ammunition.
The only time we have to select ammunition exist BEFORE the emergency arrives. Once the emergency exists (and I agree that it is highly unlikely it will ever exist) there will be no time to select ammunition.