I understand your reasons to consider death of the physical body on this planet necessary for new life to continue to be born, live, learn and then pass away also. Eventually, everyone reaches the point where physical death becomes a friend.
What I wonder, though, is whether you consider the possibility of some part of a person to live on, the soul, the conscience part, into another realm. Do you believe that ANY part of a person lives on? Not through what they leave behind, but rather what they actually take with them into another "world".
I always thought that eternal life on earth or in a physical world is impossible. It goes against all the laws of nature that the physical world must operate under. I think having children brings this to the fore, as you know for others to continue to be born, some must also leave.