After a maniac shot up a packed movie theater in Colorado last week, the prognoses were quick to arrive: Ban guns. Don’t ban guns, but ban assault rifles. Ban violent movies. Ban midnight screenings of popular movies. It is ungentlemanly to censure anyone’s reactions to such a painful tragedy, but it is in times of crisis that we most need sound ideas, and what we got after the Aurora shooting has been utter drivel. To prove the point, here’s a thought experiment: Let’s assume that one year before James Holmes stepped into the Century 16 multiplex and fired off hundreds of rounds, killing at least 12 people and wounding 58 others, the United States had banned all guns. In that scenario, Holmes is still a budding psychopath, his mind gradually consumed by violent visions. He still wants to make a name for himself by taking the lives of innocent people. But he can no longer step into a store or go online and buy himself an AR15, a Glock .40, a Remington 870, and 6,000 rounds of ammunition.