Gun-control advocates are noticeably silent when crime rates decline. Their multimillion-dollar lobbying efforts are designed to manufacture mass anxiety that every gun owner is a potential killer. The statistics show otherwise.

Last week, the Federal Bureau of Investigation (FBI) announced that violent crime decreased 4 percent in 2011. The number of murders, rapes, robberies and aggravated assaults all went down, continuing a pattern.

"This is not a one-year anomaly, but a steady decline in the FBI's violent-crime rates," said Andrew Arulanandam, spokesman for the National Rifle Association. "It would be disingenuous for anyone to not credit increased self-defense laws to account for this decline."

Mr. Arulanandam pointed out that only a handful of states had concealed-carry programs 25 years ago, when the violent-crime rate peaked. Today, 41 states either allow carrying without a permit or have "shall issue" laws that make it easy for just about any noncriminal to get a permit. Illinois and Washington, D.C., are the only places that refuse to recognize the right to bear arms. The Brady Campaign to Prevent Gun Violence did not respond to requests for comment.