A ban on assault rifles, pushed by the mayor of Chicago and our governor, is moldering in the state House Rules Committee. Lawmakers can take no action until they reconvene in October. And even then, there's little chance supporters can pick up the three additional votes they need to send the bill to the Senate. But like the villain at the end of a movie, the assault rifle ban never dies. It's just wounded, waiting to come back when you're not looking. So I thought I would look into the validity of its major argument. That is, this notion that...