Yep, totally understand your point Kim and we did have a scenario similar to
what you pointed out in your last paragraph a number of years back.

An old guy living in a house on his own in a Queensland suburb was being attacked by a group of young guys
who were drunk and aggressive. They were kicking at his door demanding money, dunno where the police were.
One of them picked up a brick and smashed his door open, yelling out that he was going to kill him.
The old guy, who did not hand his rifle in during the amnesty, pulled it out from under his bed
and put a bullet straight through the attackers chest. Once police had collected all the statements
from witnesses etc, the old guy was not charged with anything, not even manslaughter,
although it was illegal to have such a firearm there in his house.

In this case, the gun saved his life but there's not thousands of old guys out there with guns hidden under there beds.
If there were, there would bound to be at least some of them who would use the weapon for the wrong reason.

Guess that's my point and just as I'm posting this, another terrorist attack in Nice, France, using a truck and weapons.
Carrying a gun with you to protect yourself is not the answer. It has to be nipped in the bud well before guns are needed
but how??? I dunno.