“Please, I was talking to some of my old veterans friends,” he told reporters. “My response is, Lighten up and get a life.”
When reporters asked if the joke was insensitive, McCain said: “Insensitive to what? The Iranians?” MSNBC 3-20-2007
It's a JOKE, get it? Sure it the idea that the U.S. would send the Middle East into an apocalyptic turmoil by bombing Iran sends chills down the spine of any thinking person by McCain was just making a funny with his buddies so lighten up. He didn't even get into his holocaust material and his joke about the VT shootings which is always a crowd pleaser.
(Like the McCain candidacy itself.)