High statistics on gun ownership almost imply a built in instability within states or nations. How the fire arms got to be so numerous is historical, but the mathematics of future purbations are built in as a consequence of chaos in physical forces. Like butterflies causing hurricanes what do such shootings and gun laws pertend?
http://www.guardian.co.uk/news/datablog/2011/jan/10/gun-crime-us-state?intcmp=239
Time is, was and will be. Without time we would not be. What a load it has to carry! Time seems eternal! You might even ask whether cycles in time exist? If so read Roger Penrose's book on new attitudes in physics towards possible "Cycles in Time".