Now, [Robert] Novak says he didn’t realize he’d hit anyone. And if that’s true it removes a great deal of the moral and potential criminal liability. But it puts in real question whether Novak should be driving a car. If you can be driving through the relatively compact streets of downtown Washington, hit a pedestrian so that he rolls up on to your windshield and then trundles off onto the ground and you don’t notice, should you really be driving?