It makes sense to me that rights should be earned, for example by military service. Currently, if I'm lucky enough to be born in the right place, I could exercise rights that were earned by someone who came before me, at no cost or sacrifice to myself.

Of course, I could be unlucky enough to be born in a place where I cannot earn any rights, no matter what service I provide to society.

Rights or priveleges based on luck (locality, ancestry, gender) seem unjust. But nature is unfair, sometimes dramatically so. Maybe the best lawmakers are trying to compensate for bad luck (?)