People mature to the point where they realize this. This is to encourage people to have children when they are in a good place in life, to set them up for success, provide them with ample nutrition, education, and life experience to let them out into a world that cares only how people are successful or not.

This is dangerous thinking, because you would think positively for people who made improvements in their lives and the lives of their descendants. And yet at some point, other people will hone in on an advantage that your family had in the past and how that invalidates their present. And how you can't think negatively towards someone because they are in a bad station in life because it's not their fault, but their parents. But then you go to their parents and they're like, "It's not our fault, it's our parents fault. Or someone else did this to us. Because they had an unfair advantage."

Slippery slope at best, terrible discussion at worst.

Still, I base a person's merit on their potential and their drive to better themselves and their family. That kind of personal growth is what leads to good people living meaningful lives in an otherwise cold and cruel world.