In terms of the logic of argumentation, having to die is necessarily preponderant over being allowed to live. If a couple conceives a child then there is thenceforth someone there who will have one day to die. But if a couple conceives no child there is no one there of whom it might be said that they were not allowed to live.
If someone states that they find themselves unable to accept their own having-to-die, it is no valid retort to say to them: “But you wanted, after all, to exist, didn’t you?” Such a retort is invalid because, pre-existentially, there was in fact no one there who was striving or pushing to exist.