Banning Firearms for household or anyone to buy with license will drastically affects in society and crimes. No one can guarantee a human reaction of next moment. If you have items to damage in your control at the time of anger then there is surely no guarantee you wont use it and later regret it.
School shooting is just another example of taking the anger out on public. For whatever reasons, these psychopaths needs attention and treatment or perhaps they are deprived for love and care , but no one has right to kill someone in any condition or just because i under a complex of not having something ideal in my life?
European countries are an example of gun free environment atleast U.K, Canada. Lets police for self defense situation not the guns at home.