There has to be a Cosmic reason for the existence of the past-life (reincarnation) process. It has to involve moral progress through experiencing a sequence of Earthly lives.
In a long chain of Earth-life experiences over time, each past-life lesson should have a role to play; to contribute to progressive learning. In this life, I have learnt to forgive, a significant change for a former fighter. I do not seek the sound of someone’s family jewels hitting the ground, with a little sliced help from me.
While it is probably beyond the competence of a normal human mind to obtain an understanding of the place of mankind in the Cosmos (not just on Earth), it is the reincarnation process which suggests that there is an underlying pattern.
Perhaps it is best that we keep trekking on our individual paths of destiny (using our free will), and let the Cosmos lead us individually and collectively to where it will. We should find joy in the journey, without worrying about our destination.