Terrible tragedy! Of course we had the horrendous shooting of children in Dunblane many years ago. And the drive-by shooting in Hungerford. Don't really know what is happening to this country these past few years. 
Dunblane is local to me and i knew the man who killed those innocent children, His name was Thomas Hamilton
His motive was revenge on the community as he felt he had been persecuted by the public.
As a child i had attended his club " Dunblane boys club" until my father found out who was running it and stopped me going.
The reason my father gave me was that Thomas Hamilton had been encouraging young boys to do things like remove their tops on camping trips and had made boys sleep in his camper van , while he was never charged with anything it was deemed inappropriate behaviour and with questional moral intentions and many parents unhappy with Hamiltons conduct.
Doug