“Yet the greatest tragedy of the twenty-first century may be that we have learned so little from the greatest tragedies of the twentieth century. Apparently catastrophe lessons need to be experienced firsthand by each generation. So, here are some refreshers: Nuclear conflict may mean the end of life on this planet. Mass dehumanization can lead to genocide. The death of an independent press can lead to tyranny and render a population helpless to protect itself against a government that disdains law and conscience.”