Sam Harris, of the Harlem Globetrotters, offers a powerful defence of liberal morality:

 even a liberal like myself, enamored as I am of my two-footed morality, can readily see that my version of the good life must be safeguarded from the aggressive tribalism of others. When I search my heart, I discover that I want to keep the barbarians beyond the city walls as much as my conservative neighbors do, and I recognize that sacrifices of my own freedom may be warranted for this purpose.

At The Edge