Life, love, happiness, and hope. What wonderful things we will be denying to our children, and children's children if our species doesn't continue. Propagation

Life, love, happiness, and hope. What wonderful things we will be denying to our children, and children's children if our species doesn't continue. Propagation, and the want to make ourselves better through our children is an ancient need, and hope. Why wouldn't it be the single most important thing?