First, federal courts do not permit TV cameras in the courtroom, so the opportunity for “real time” jihadist propagandizing won’t exist. And while defendants and their lawyers can question witnesses, they cannot make speeches; judges are kings in this domain and can quash irrelevant oratory. Some point out that in earlier terrorism trials, like those of the plotters of the 1993 World Trade Center attack, the defendants did ramble at length. True, but does anyone who fears a circus now remember a single word from those earlier trials?

The real propaganda event is likely to unfold very differently. Instead of Khalid Shaikh Mohammed making his case, we will see the full measure of the horror of 9/11 outlined to the world in a way that only methodical trials can accomplish. Historically, the public exposure of state-sponsored mass murder or terrorism through a transparent judicial process has strengthened the forces of good and undercut the extremists. The Nuremberg trials were a classic case. And nothing more effectively alerted the world to the danger of genocide than Israel’s prosecution in 1961 of Adolf Eichmann, the bureaucrat who engineered the Holocaust…

To be sure, some of these men’s arguments don’t go far enough to please Western ears. But they are shaping opinion. Polling since 2001 has shown that in most Muslim-majority countries, tolerance for terrorism and support for Al Qaeda is gradually eroding. It is strongly in our interest to reinforce these trends by underscoring the terrorists’ killings of civilians and our own commitment to the rule of law.