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If you were ever moved to search for Rudy Giuliani’s integrity, you might start at Fox News.

That is where, in an interview on Friday morning, he let loose a gusher of right-wing drivel about gun rights. His argument would have been senseless and repellent anytime, but it was particularly grotesque coming the morning after yet another gun massacre, in Oregon, and coming from a former moderate Republican mayor who once understood the deadly toll of unregulated guns, and knew that gun laws needed fixing.

He was asked his reaction to President Obama’s weary, angry call on Thursday for an end to the slaughter.

“I think the president has very little knowledge of what causes crime or how to reduce crime,” Mr. Giuliani said. “The reality is gun control laws control the behavior of legitimate people. People who rob stores, people who rob banks and people who are insane and want to go ahead and murder don’t follow the gun control laws.”

He went on: “It’s the behavior of people, it’s not the guns.”

That’s not what he used to think.

In 1993, he joined those calling for a national system of gun licensing, “with stringent but realistic criteria.”

In 1998, he proposed a law to require New York City gun owners to buy trigger locks.

And in 2000, he said New York would file a federal lawsuit seeking tens of millions of dollars in damages from gun companies as compensation for the injuries and deaths caused by their products. The Times headline: “Giuliani Joins the War on Handgun Manufacturers.”

People outside New York know Mr. Giuliani as a periodic presidential also-ran, a pitchman on identity-theft infomercials, and, of course, as the mayor of 9/11. Those who know him best understand that his credibility on policing, terrorism and homeland security is badly overblown (try Googling his name with the words “Bernie Kerik felon prison” or “World Trade Center command center”).

Still, he surfaces regularly on Fox, adding his one note to the anti-Obama chorus. It’s usually best to ignore him. But sometimes the toxicity is too great, the lies too extreme. As on Friday — when he ridiculed the president and sided with the gun-nut lobbyists who believe that there can never be too many guns, and that the only solution to too many gun deaths is more guns.