I'm fine with the idea of securing arms... But I refuse to become a prisoner to some set of mandatory security. I use a gun safe and various trigger locks and dead bolts and other things to keep my arms safe and secure.
Should someone violate my house and violate all these protections I feel I have made reasonable steps. Even the strongest safe can be broken. To say that someone braking into a house and stealing arms of the home owner is the homeowners fault is non sense. Safe or no safe a crime has been committed.
You want to stop mass murder. Find a way to out law evil. Any driven individual willing to die to accomplish murder is essentially unstoppable.
Do I recommend a safe and security measures, of course... But what I really recommend is a lawfully carried weapon.