Doctor alive only because he defied a "gun-free zone"

As reported by USA Today, a doctor shot a patient after the patient shot and killed a caseworker in his office. The facility is a "gun-free zone," which means that the doctor violated that policy. Thank God he did because otherwise it is almost certain that he'd be dead as well as an unknown number of others. It is another illustration of what gun advocates have been saying for years: "gun-free zones" are places where only the criminals have guns. Fortunately, there are some peaceful citizens who defy the policy.