Fester re Adam Lanza he should never have been able to gain access to those guns as you well know.
In this country people have had their certificate withdrawn for such an occurrence ie allowing anyone to have knowledge of a cabinet keys location and so allowing an unauthorised person access to their weapons just because of the potential for these incidents to occur.
Your laissez faire attitude to unregulated ownership makes these incidents more likely.
Dates for Dunblane ???