Status rules. If a famous person walks into a store, that person will be treated far better than someone who is not famous.
The concept that all people are equal is part of a dated ideology. It has no part in reality. People are treated differently according to their status. Status has always existed. It exists in all herd species.
You are looking for evidence to support the idea that all people are equal. If a nuclear scientist is capable of greater harm than a bricklayer, it just proves that they aren't equal.
Much of what you are saying is part of an ideology that people are spiritual beings who have some sort of eternal destiny and who are here to learn.
Generally people who believe that have experienced some sort of loss, and they are looking for a reason for that loss. One reason they might accept is that the loss occurred because they had to learn a lesson.
With respect, I don't believe that to be true. I think we are just an accident of life, with an imprinted purpose to survive and reproduce, and an instinct to want to do that in the easiest, most pleasant way possible.
I think the best way to live our lives, and I think it's all we get (there is no evidence of an after life), is to find the easiest, most comfortable way to survive (without harm to others), and then to enjoy the things we find pleasure in (without harm to others).