DDS
That's the whole point. He would have had to go somewhere else. Not picked up a gun in his own house where - I suspect - he knew where it was. He would have had to do more. Maybe, just maybe, that would have been enough to make him do something else. I guess that we will never know.
Of course move the problem somewhere else, as I said you will never ever legislate for the nut cases, so why penalise the law abiding.
If you are going to penalise law abiding gun holders lets start using that principle for all other walks of life, murdering doctors, football hooligans, knife crime, killer drivers, pub landlords for supplying alcohol.