On Monday, when he announced that a grand jury had declined to indict two Cleveland police officers in the 2014 shooting death of 12-year-old Tamir Rice, Cuyahoga County Prosecutor Timothy McGinty said enhanced video of the incident showed the boy was drawing what looked like a gun from his waistband. Although the object was actually an Airsoft pellet pistol, McGinty said, Timothy Loehmann, the officer who killed Tamir within two seconds of arriving at the scene, had no way of knowing that. Even if we accept this account, it does not explain why Frank Garmback, Loehmann's partner, drove right...