Very briefly: Calling Sandy Hook a "tragedy" is part of the spin that will place the event beyond human control, which is exactly what the NRA and the rest of the Gun Cult want to achieve as quickly as possible. With the shooter murderer conveniently dead, the criminality of what he did won't be explored and it needs to be. Calling this atrocity "tragic" or chalking it up to "evil" lets this perp and future perps escape the true judgement and condemnation of civilized society.
This was the act of a human being with a gun. It wasn't an act of God. We can't do anything about an act of God, but we damn sure can do something about human beings with guns.