Very interesting topic. If I may take purely bioligical approach.The language we use around suicide confusee the evolutionary perspective. If we just view ourselves as cellular beings which is what we what we are, 20 trillion or so cells. Then its easier to understand suicide. To preserve low food, the safety of the group and to prevent less than optimal contribution to future generations which could wipe out a line of genes then the cells activate apoptosis on a massive scale. . Apoptosis is cell death. bat