Good question. But a lot of people on the prosecution or the judicial side don't seem to think Peltier did.
"Pine Ridge was a powder keg with the Goon Squad operating there with the government's help. AIM was there to protect those who were not part of the Goon Squad. There were many murders and assaults in a three-year timeframe. When plain-clothed agents in unmarked cars arrived, a firefight ensued. Leonard did not shoot the agents, and the FBI knew this but withheld evidence. The court of appeals acknowledged this but couldn't overturn the conviction due to legal standards. Judge Heaney, who wrote the opinion, later supported clemency for Leonard. Now, 38 of Judge Heaney's former clerks support parole for Leonard, including three who worked on his case. The government admits they don't know who killed the agents, but it wasn't Leonard. It's time to release Leonard and start the healing process."