You're right, no amount of apologizing can change the past. They're stuck with it. If they want to stop doing evil in the future, good on them, though continuing on with the same organization that perpetrated those evils doesn't give me great confidence in that. But don't apologize and expect the rest of the world to forgive them. The things they've done cannot be erased, and so they cannot be forgiven and their apologies are hollow and meaningless.