This is, in large part, a huge problem within our judicial system. It takes far too long to bring accountability. This should not be on-going 21 years later. The judicial system in America is broken...beyond repair. There is no justice in the justice system.
https://www.cbsnews.com/news/9-11-attacks-khalid-sheikh-mohammed-guantanamo-bay-plea-deals/
5 Guantánamo prisoners accused in 9/11 attacks could get plea deals - CBS News
The potential plea deals could take the death penalty off the table and keep the detention camp at the military base in Guantánamo Bay open for the foreseeable future.
https://www.cbsnews.com/news/9-11-attacks-khalid-sheikh-mohammed-guantanamo-bay-plea-deals/