They were wronged. What they are asking for is justice. Their own story. They are trying to make clear that something awful happened here. There cannot be impunity.
Some political responsibility has to be taken.
And so the process is to say, either it is through a truth commission where you lay out the facts and names may be named, or you go the route of trials where you actually prosecute people. So the way science operates here is one of gathering the facts in a hopefully impartial manner. It is a fairly straightforward process.