Cosmic 'justice' in a nutshell

Whether you believe in reincarnation or not, for a minute just assume it is true. It is the perfect explanation for the so-called injustices at birth. Why are some born in very difficult situations and others born into easy situations? The seemingly unjust and unfair nature of destiny at birth has a very simple solution if you believe in reincarnation. The so called 'justice' meted out by God or Universe or Cosmic Spirit or Creator does not necessarily have to happen in this life. The 'justice' itself being the Universe's way of balancing out karma. The goal I feel is not punishment per se, it is actually a lesson. For those of you who believe it, essentially all souls are good and will return someday to their source. However, how long it takes and how many lessons need to be learnt varies from soul to soul. This is what I believe.