There are so many things wrong with this I don’t even know where to start.
There’s a basic problem in application here. The only way guns could have prevented 9/11 is if passengers on planes were allowed to carry guns, which I hope everyone will agree is a terrifying idea.
Aside from the cartoon itself making absolutely no logical sense, it is also advancing a terrible argument. People have a very interesting perspective on what to be frightened of. I am not seeking to minimize the tragedy of September 11, 2001 in the slightest, but it is something that happened once, and which the intervening ten years have shown is highly unlikely to happen again. Meanwhile, people are being killed by guns every day, every week, every month, every year. But no one cares about that compared to a sensational event that happened once.
Do you know how long it takes for the same number of people who died on the terrorist attacks of September 11, 2001 to die in gun-related crimes? 35 days. Nearly every month, the same number of Americans who died on September 11, 2001 are being shot and killed not by terrorists, but by other Americans.
Guns don’t kill people… oh, wait. Yeah, they definitely do.