The problem is that the identity obsessives want to boil down everything in American life to these categories. In practice this means allocating political power, contracts, jobs and now even salaries in the private economy based on the politics of skin color or gender rather than merit or performance. Down this road lies crude political tribalism, and James Damore’s recent Google dissent is best understood as a cri de coeur that we should aspire to something better. Yet he lost his job merely for raising the issue.

A politics fixated on indelible differences will inevitably lead to resentments that extremists can exploit in ugly ways on the right and left. The extremists were on the right in Charlottesville, but there have been examples on the left in Berkeley, Oakland and numerous college campuses. When Democratic politicians can’t even say “all lives matter” without being denounced as bigots, American politics has a problem.