I whole heartedly agree with the premise of securing firearms when they are not being used, and I also agree with the premise that we all have a duty of care to our society not to make their appropriation by outsiders any easier.
Personally, rather than having a gun in every room, if you really feel the need for that kind of protection indoors, keep one gun on you and the rest locked away. That way if anything goes awry, wherever you are, there is your gun.
Best way to stay safe in your own home is to have decent doors and windows, IMO, not a pistol under every place mat and cushion.
I also agree with Tom's view of guns left in cars...
When the right to effective self-defence is denied, that right to self-defence which remains is essentially symbolic.
Freedom: Please enjoy responsibly.
Any idea that relies on murder for its survival in intrinsically weak.