Example. Last week, a retired Chicago police officer mistakenly shot his own son after he thought he was an intruder. A Connecticut father also killed his son thinking he was a burglar.
Manta, I am not aware of the Chicago incident, but I do know the details of the CT one.
If you were in that man's shoes are you saying that you would not have fired? That would be an ignorant thing, to say the least. All the father knew was that there was a masked assailant moving towards him with a knife. If your gun wasn't already in Condition 1, you would have gotten it there very quickly and fired.
That wasn't even a situation where training was needed, as Glenn said. The homeowner reacted just as each of us would based on training.