Now, those who were killed and injured here were gunned down by a single killer with a powerful assault weapon. The motives of this killer may have been different than the mass shooters in Aurora or Newtown. But the instruments of death were so similar. And now another 49 innocent people are dead; another 53 are injured; some are still fighting for their lives; some will have wounds that will last a lifetime. We can't anticipate or catch every single deranged person that may wish to do harm to his neighbors or his friends or his coworkers or strangers. But we can do something about the amount of damage that they do. Unfortunately, our politics have conspired to make it as easy as possible for a terrorist or just a disturbed individual like those in Aurora and Newtown to buy extraordinarily powerful weapons, and they can do so legally.