I am all for understanding human evolution. I do wonder, however, if understanding that our brain/genes package has evolved to support the continuation of our genes is sufficiently a "meaning" to our life in the goal-less Universe. Yet, why should a "logical argument" for not caring for the future of humanity be more meaningful than a naturally evolved propensity to care for that future?
Existence before essence; we are what we are not only from our own personal choices but also from choices of our ancestors and the selection processes of evolution on our species. Is there meaning in this...?