it shouldn't be implemented?
"Lets not fix the hole in the boat because it won't get rid of the water that's already inside"
The only way that is logical is if you want the ship to sink as fast as possible.
To use your analogy, I don't see the hole in the boat is the gun. That hole in the boat is the shooter's lack of conscious that he was killing people. It was his lack of regard for human life.
That is what sunk the boat. The gun was a tool. Much like a rental truck (the market square incident in Spain). Much like a home made, pressure cooker bomb (Boston). The list goes on.
~Jeordam
Saving the Princess, Humanity, or the World-Entire since 1985