A quarter-century after September 11, 2001, the United States remains trapped in a legal purgatory of its own making. On Monday, the Supreme Court declined to revive plea agreements for Khalid Shaikh Mohammed and two other men accused of orchestrating the deadliest terrorist attack on American soil, effectively guaranteeing that the government will pursue their execution rather than accept their guilty pleas in exchange for life sentences.

The decision is not a vindication of justice delayed. It is a reminder that the post-9/11 security apparatus—black sites, enhanced interrogation, indefinite detention without trial—created problems that no court, no administration, and no amount of time has managed to solve.

The torture problem that won't disappear

KSM, as he is known in counterterrorism shorthand, was waterboarded 183 times by the CIA. His co-defendants endured similar treatment. This history has made prosecution extraordinarily difficult: evidence obtained through torture is inadmissible, witnesses are compromised, and the government has spent two decades fighting to keep classified details of its interrogation program from surfacing in open court. The plea deal, negotiated earlier this year, was an attempt to sidestep these complications. The defendants would admit guilt; the families of victims would get closure; the government would avoid a trial that might expose its darkest chapters.

Defense Secretary Pete Hegseth revoked the agreement in August, reportedly under pressure from victims' families who wanted the death penalty on the table. The defendants asked the Supreme Court to reinstate it. The justices, without recorded dissent, said no.

What a death penalty trial actually means

The military commission at Guantánamo Bay has been attempting to try KSM since 2008. Eighteen years of pretrial hearings have produced thousands of pages of motions, multiple changes of judge, and precisely zero verdicts. A capital trial will require the government to prove its case while simultaneously preventing defense attorneys from revealing how their clients were treated in CIA custody—a legal contortion that has already consumed years and shows no sign of resolution.

The families of 9/11 victims are divided. Some want executions. Others, exhausted by decades of waiting, had accepted the plea deal as the only realistic path to finality. Monday's ruling gives the first group a theoretical chance at the outcome they seek, while offering the second group nothing but more uncertainty.

Our take

There is no clean ending here. The men who planned 9/11 are guilty; that much is not in dispute. But the machinery America built to punish them—extrajudicial detention, secret prisons, interrogation techniques that meet any reasonable definition of torture—has made conventional justice nearly impossible. The Supreme Court's refusal to revive the plea deal does not bring closure. It simply extends a legal saga that has already outlasted three presidencies and may well outlast a fourth. At some point, the pursuit of perfect justice becomes its own form of injustice, both to the victims who deserve resolution and to a legal system that was never designed to operate in permanent exception.