So you justify a discriminatory social order that ossifies your place at the top by pointing to your religious belief in reincarnation. Surely you can see that that is not a compelling argument to anyone who doesn't share your religious beliefs. Religion is constantly used to justify bigotry.
For kicks, I'd like to take on your argument for reincarnation.
You argue that there must be a reason some people are born into fortune and others misfortune, otherwise the world would be unjust. And if the world were unjust, then I would be unable to complain when the government is unjust.
But I counter that yes, the world is unjust. Good things happen to bad people, bad things to good people, and we all are born into circumstances that we had no part in shaping. That is the state of nature. But regardless, we can and should create a society and government that seeks to be just.
Your argument assumes that the reader must believe the universe is just to demand that the government is just. But that assumption is unwarranted. Why should I believe in cosmic justice before I demand my government administer justly?
And then it requires a marvelous measure of optimism to hope that this game of semantics will create such a logical quandry for the reader that they will find no other means to resolve the paradox than to imagine first, that there must be a soul or spirit, and second, that that soul is reincarnated after death. What optimism to imagine that an entire metaphysics will be accepted as the solution to this paradox before the reader reconsiders the premises and chain of reasoning that led to this point. I would sooner conclude that the premise that not all humans are born equal is false than accerpt the conclusion of reincarnation. It's a far smaller leap.