Comment Your Numbers Are Weasly (Score 1) 2987
2 "seriously" injured, 20 others lightly wounded, no deaths (so far). This is what happens without easy access to automatic weapons. You're going to have sociopaths and psychotics everywhere, but only in the US (and maybe Afghanistan) will they have such easy access to such lethal weaponry. Absent this lethality, it's a lot more difficult for these people to create such efficient carnage.
You want your "right to bear arms" organized around individuals and not through State militias? Give everyone access to a 1776 -era state of the art musket. See how many kids they can shoot on a rampage then...