There are plenty of indicators of doom: Donald Trump riding roughshod over U.S. constitutional norms; the rise of high-handed strongmen across Europe supported by ethno-centric crowds; free press and free voting under attack by cyber manipulation. Add mass migration threatening borders and national identities; rising wealth inequality; politics gridlocked by strife about rights, benefits, and duties, amidst growing resentment of "global elites" and new would-be citizens; and evolving confusion about the nature of the "common good."