No matter how one tries to play with this, the simple fact is that extensive and independent studies have confirmed that keeping a loaded gun in one's home makes one's family less secure-- period. Yes, one can find examples to find exceptions to any rule, no doubt, but the overall verdict has been in for quite some time now.
Just to clear the air, I am not "anti-gun", have not proposed repealing the 2nd Amendment, and will readily admit that in some cases a family may be better off keeping a gun handy in their home.