You could say that CNN’s Piers Morgan is becoming more open minded; in his tweets promoting tonight’s interview with Michael Moore, he acknowledged that it could be either fear or aggression — certainly not a rational desire for personal protection — driving gun sales in the wake of last week’s Aurora, Colo. massacre.

The “Bowling for Columbine” director told Morgan he was loath to be on with him and promised not to come on “another **** TV show” again to debate the issue.

Funny, but we don’t recall having to go through a background check to get a car wash.

Moore told Morgan he wishes Americans would stop treating the Constitution as if it were inviolable and etched in stone — although were that true, the Second Amendment, added in 1791, wouldn’t exist.

Moore insisted on injecting class and race into the issue, noting that “most of those guns are in white people’s homes” and asking what these suburban gun owners have to fear: “little freckle face Jimmy down the street?”

Moore seemed almost giddy to have the opportunity to weigh in on the George Zimmerman case, suggesting that if Zimmerman had the legal right to carry a gun, Martin certainly had an equal right to kill Zimmerman for stalking him. “Doesn’t Trayvon Martin actually have the right to kill George Zimmerman if George Zimmerman is stalking him and the police have told him not to stalk him?”

Never mind that President Obama already brought his own children into the scenario by observing that they too go to the movies (though, we imagine, accompanied by Secret Service agents); Obama may be “such a great guy,” but his empathy wasn’t good enough for Moore.

“We have to see these young people who were killed as our children,” Moore insisted, his compulsive collectivism leading him so far as to claim paternity of those in the theater: “We have to realize those were our children who were killed there,” he said, apparently unaware or unconcerned that the victims ranged in age from 6 to 51.

Moore concluded by demanding that Americans rise up.

We’ve learned something tonight: that Piers Morgan will stop talking as long as you keep saying things he agrees with. But what else have we learned?