Deserve? That implies we must have done something to earn this right. I do not think it works like that. Evolution has no need for the deserving, only those who can survive. No, we have done nothing to have some special dignity. One mutant virus, one meteor, one madman and humanity could go the way of the dinosaurs.
90% of all species have already gone extinct. Of that 10% remaining, 80% of those live in the ocean. The earth has always been a cycle of animals coming into existence, and eventually going extinct. The earth changes, it is not static. Our climate changes, oceans change and with that change, the animals and plants that occupy the planet change also. So far we have found human fossils dating back a few million years. The dinosaurs were around for 150.000,000 years. They were pretty successful, but in the end, they did not deserve existence.
The right to exist is the ability to survive and has a somewhat random quality to it. I don't believe anyone deserves existence.
Love always,
Elizabeth