Just to present the other side here--obviously there was a deal made that if Pinochet would step down, he could have immunity--Which is more important, removing a brutal ruler from power, or "punishing"?

Remember, Castro has been watching these proceedings carefully, not I'll wager, to make sure that Pinochet is punished, but rather to see if it is possible for a Dictator to "retire"

If Pinochet is 'punished", the message is clear, if you take power through use of force, you must hold on to it at any cost, because you can't trust the Western Powers to let you walk away--