Step back a step and think.
The only to develop faith in the government is to have a trial of officials that are widely believed to be involved in criminal acts of terrorism.
There is good reason to believe the trials (there may be more, shias even) could not take place while Americans were there. We would be accused of complicity and taking sides.
The relations there are complex and there are many many old grudges to be negotiated and resolved. The process is underway now thet we are not trying to referee.
Yeah, but it’s like having Al Capone in the PM office, calling for Bugs Moran to be turned over and face trial. Moran may end up at the end of the rope, but the criminal enterprise rolls on, with Capone consolidating more power.