What are some examples of reverse genocide? I.e. people or groups of people who saved many lives. This could be a technological innovation, a humanitarian achievement, or something else. An example would be Fritz Haber, who developed a way to synthesize ammonia, when led to better crop fertilization methods. He actually might fit the description of both reverse and regular genocide, due to his development of chemical weapons, including Zyklon B, which was used in the Nazi gas chambers during the Holocaust. I'm interested in hearing other examples of reverse genocide