"I was just following orders."
Now, on more local scale.
In a politically divided country, this is all quite tricky and potentially sticky, looking to criminalize the actions of CIA agents when under the management of a bunch of malicious doofuses will only be further divisive.
I still think going the truth and reconciliation commission route would be the best for all concerned. Facing the truth with no political gain on the line -- even if only perceived -- would truly be Change to believe in.