A HIGH CALIBER OF CITIZENS: University of Chicago economist John Lott
  studied crime statistics in states that have "relaxed" laws about
  carrying guns. He found that the crime rates in "right to carry"
states
  went down, sometimes way down, after passing legislation allowing
  responsible adults to carry guns. Murders fell an average of 8
percent,
  rapes 5 percent and aggravated assaults 7 percent, while at the same
  time in the U.S. as a whole murders went up 24 percent, rapes went up
  71 percent, and assaults went up more than 100 percent. And in those
  states, the death rate in mass public shootings -- such as a crazed
  gunman opening fire in a crowded restaurant -- dropped 69 percent,
  while deaths from accidental shootings increased by only about one per
  year. Hardly a gun freak, Lott has never been a member of the National
  Rifle Association and didn't even own a gun when he started his study.
  But once he saw how clearly the statistics were turning out, he bought
  one. (Time)

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