Last week was hardly the first time that we have found ourselves scratching our heads in anguished confusion about what, exactly, President Bush is trying to achieve by trashing the Constitution at Guantánamo Bay. But the sentencing of Osama bin Laden’s driver, Salim Ahmed Hamdan, to five and a half years in prison is a good moment to stop and reflect.

For years, Mr. Bush and his supporters have been telling the world that it is necessary to hold prisoners without charges, to abuse them in ways most civilized nations consider torture, and to deny them basic human rights because of the serious threat they pose to America. These are “dangerous terrorists captured on the battlefield,” Senator John McCain, the Republican presidential candidate, said in a statement on Wednesday.

The administration considered Mr. Hamdan such a priority that it took his case all the way to the Supreme Court, insisting Mr. Bush had the power to hold anyone he deemed an enemy combatant for as long as he wanted under any conditions he wanted. Mr. Hamdan’s trial was the first by a military commission in Guantánamo.

We use the word “trial” loosely. The proceedings were marked by secret testimony by secret witnesses. The former chief prosecutor in Guantánamo testified that he quit after being told that these trials could not produce acquittals. In the end, Mr. Hamdan was found guilty only of providing material support to terrorists and was sentenced to five and half years  a term he might complete before year’s end. Still, in the twisted world of Mr. Bush’s prison camps, it is unclear if Mr. Hamdan will be released after serving his sentence.