Five months in jail for driving Mr. bin Laden? Only in America! Salim Hamdan, Osama bin Laden’s former chauffeur, recently won an appallingly light sentence for aiding al-Qaeda. Hamdan’s apologists call him a hapless, innocent motorist. If so, anyone steering a bank-job getaway car is “just a driver.” Hamdan is no naïf. He is a camp-trained al-Qaeda member who a Guantanamo military tribunal convicted of giving “material support” to America’s chief enemy in the War on Terror. Hamdan transported weapons (including two shoulder-launched missiles with which he was caught), drove and hid bin Laden, and guarded this mass murderer with...