I don't. Perhaps you missed the 'if' at the beginning of my statement. Anyone's decision to have children would obviously align genetic self-propagation with personal goals.
Perhaps you missed the 'would' in mine?
Actually, the well-being of one's children, each of whom share only 50% of one's genes, isn't completely aligned with the survival of one's genome.
But in any case, I know why evolution would tend to cause one to favor one's biological children; but I'm not sure how New Testament ethics justify favoring them.