15 pounds per square inch. That is the force required to crack open the human skull. Doesn’t sound like much does it? That’s because it isn’t. But is it enough of a reason to defend yourself with a gun? Does it cross the Mendoza line? That is the question now being argued in the George Zimmerman case since the prosecution’s main witnesses basically blew up in his face. The first, Rachel Jeantel, alluded that Martin was spoiling for a fight since he noticed a “creepy ass cracker” was following him. The second, John Good, described the scene he witnessed with Trayvon Martin atop Zimmerman raining blows down upon him, “ground and pound style”. So we find ourselves with a neighborhood watch captain, investigating a stranger in the neighborhood and then calling the police to report it, on his back being bludgeoned by a middleweight. This is the moment. This...