Why can't we think straight about the big issues that face our society? Why are we taken in by the phony arguments of populists and scammers? Where are the philosophers hiding when we need them to tell us what makes sense? They are hiding because they have nothing to say. The airy-fairy answers...

People who put the public good before their own self interest have been admired throughout history. But what is the public good? Sages and prophets who think they know better what is good for us than we know ourselves held sway on this subject for more than two thousand years. The world had to...