That is why intention is the thing that karma depends on, not the outcomes. "Kamma is intention"Of course in these cases we can claim to know which political position was "correct" based on previous experience, or after the fact via reflection.
But that is rebirth you are talking about not kamma. The law of kamma says that there is justice and that this justice is a natural phenomena, not something enforced by a judge.I doubt your claim that rebirth gives us justice. Firstly, if rebirth is true, then it's a natural phenomena, like lightening. A description of nature doesn't give us morality or justice. Such an appeal to nature is a fallacy. What is natural doesn't necessarily equal good or evil. It just is.
Any appeal to kamma-vipaka would merely describe a force of nature, so it seems that we can't find justice or morality in the theory of kamma.
Who said that is so ? There is how christians view justice, not buddhist. There is no supreme judge with a fixed set of rules like real world judges. If you break the civil law for good intentions and you get caught, you will probably get punished because that's what the law says. But even here in the worldly justice sistem, the punishments are not fixed and are dependent on the judge opinion and circumstances for the exact reason that you have a problem with. Only christians believe there is a specific set of golden rules that can not be broken for no matter what reason.Also, if I grant your point, how can it be just for a man to experience suffering because he lied to save the life of another?
In buddhism, there is no such judge and such rules. The outcome are also not important. Remember "kamma is intention" . That is why it's the only system that I consider just.