How much luck do we need to think correctly? How much luck do we need to act correctly?
If I had been born five thousand years ago, or even today in a backwards community, I would think that the Earth was stationary. I would be wrong, because unlucky. Put positively, I was born rich in astronomical knowledge because of the hard work and courage of human beings who came before me. I just lucked out to be born in an era and community where I learned the truth about heliocentrism.
Similarly if I had been born without the cogntiive skills to understand heliocentrism I would, through a piece of bad luck, not understand the solar system. When it comes to the harder areas of modern physics and cosmology I in fact am a victim of this kind of bad luck — I don’t have the brain power.
Similarly if I had been born in a rigidly stratified society I might think that it was okay to oppress the unfortunate because they are of a lower metaphysical status than I am. I would be a gigantic jerk, because I was not lucky enough to have been born as the heir to more refined and compassionate moral thinking.
Am I in the same position regarding the right course of action now? Am I unlucky enough to be morally blinkered. Almost certainly.