What about “I just don’t want one.” is that not a legitimate line of thought? That was what I based my decision on. I have never understood why the default state was marriage and then have a family. I can tell you that me and my childless wife are family.
I find that the people who spout so much about passing on their genes, or passing on their legacy or keeping the bloodline going. Are the people who you would least like to see pass on their genes. I find it to be the height of narcissism.