Issues with the concept of birth and re-birth

Issues with the concept of birth and re-birth

The whole of concept of Hereafter (Life after death) rests on complete justice.
One fundamental principle in establishing justice is to make sure that the person who is punished or rewarded is aware why he is punished and rewarded.
For example: the court will not hang the convict if he is insane. The court will wait for him to become sane, as the convict needs to understand that he is being punished for his crime.
You would also be aware that when the judge reads his judgment, he clearly mentions the crimes the convict has done and the corresponding punishment for each crime. This is to ensure that the convict is fully aware, why he is being punished.
Keeping this in mind, we will examine the concept of birth and rebirth.
1. Do we know if our birth in this world is our first or second or third or Nth?
2. Do we know for what previous actions of ours we are rewarded or punished in this birth?
If the answer is NO for both the questions above, how can we say that complete justice has been established?
When our judicial system does not accept punishing a person without letting him know why he is punished, how can we imagine that God who is most wise, Knowledgeable and most just, will punish human beings without letting them know the reason for punishment?
Another aspect of justice is for the victim to know that the aggressor was punished. For example: A man rapes a woman. The man is the aggressor and the woman is the victim. The woman is called to the court and is made to witness the judgment (punishment) for the aggressor. Our common sense would tell us; this is how it should be.
Is this aspect of justice found in birth-rebirth? The answer is NO.
For example: What happened to Hitler? Was he punished? If yes, how many births has he taken? (Ideally, he needs to take 6 million births). Do the people who were killed by him know that Hitler was punished and do they know how he was punished? Were the poor victims of Hitler compensated?
None can answer these questions.
How can we expect such a huge flaw in the justice system of God?