Psac,
You say that "Compassion doesn't have anything to do with the Golden Rule per se" ?
Compassion IS the Golden Rule.
"Do unto others as you would have them do unto you" is one biblical translation. One's personal experience is the instructor of course. We know what is good for ourselves and are enjoined to consider that this is likewise the same for others. What hurts me will likewise pain them.
The Golden Rule, also translated as "Love thy neighbor as thyself" was well illustrated by Jesus' story of the Good Samaritan. Whether or not the Samaritan had suffered himself at the hands of robbers, we do not know. We do not know whether or not the priest or the levite had ever been beaten. But the story says the Samaritan, when he saw the beaten man, had compassion on him.
The story in Luke 10 both tells us the meaning of the Golden Rule (compassion) and how far it is meant to extend.
But the rule is not concerned with the origins of suffering. It simply relates how we should relate to sufferers.
You may choose to believe that God will at some future date restore the dead who suffered and died. But this much I can see for myself: the world is full of suffering and humans do NOT always respond with compassion to the sufferings of others (again, see the behavior of the priest and the levite in Jesus' illustration). Therefore, suffering on the scale that was manifested by the tsunami is a profligate, callous waste of life if this was God's way of re-hashing a precept that is/was already familiar to most people on earth while He himself disregarded the good example of that god-damnedSamaritan.
If suffering proves the compassions of God and his existence, then I hope I burn in hell.