The film "Casablanca" has many famous lines, but none more immortal than Capt. Renault's order after seeing a Nazi officer shot by Humphrey Bogart's character, Rick Blaine: "Round up the usual suspects."
He issues that command to give the impression he's trying to solve the crime. In the aftermath of the Newtown massacre, the Renault approach is alive and well.
The three suspects commonly cited are the purported danger of certain firearms, mentally ill individuals and modern forms of entertainment. They all make plausible culprits, until you look closely.
The first is our old nemesis the "assault weapon." The Newtown shooter used a Bushmaster semiautomatic rifle, which resembles a military model, and several 30-round magazines.
President Obama and several Democratic senators are therefore calling for a renewal of the "assault weapons" ban that expired in 2004.
But the guns they would ban are functionally identical to innumerable guns that would not be outlawed. Contrary to myth, these firearms don't produce bursts of automatic fire, don't "spray" bullets and aren't any more lethal than other semiautomatic guns. They are exceptional only in how they look.
What would a new ban achieve? As Reason's Jacob Sullum noted, Connecticut forbids the same assault weapons covered by the old federal law. Under its terms, however, the gun used by Adam Lanza was legal.
The gun-control advocates also want to prohibit high-capacity magazines, limiting them to 10 rounds. The lifesaving value of this change is likely to be close to zero. Ordinary street thugs rarely fire many rounds, and those intent on slaughtering large numbers of victims can carry multiple magazines and multiple guns. That's exactly what Lanza did.