All moral issues are usually hot topics. That said, why not try writing about medicines and its effects on human evolution.
Since humans started using medicines to overcome illnesses, and more importantly to keep people from dying. Humans with genetic defects are able to live to reproduce. In this way they are able to spread their bad genes to their children.
Overall this has allowed humans that used to be too weak to breed, and who would have normally died from said diseases, to have offspring like a normal healthy organism.
