How do we respond to evil?

Although no one marched through my sleepy Maine town this week, carrying torches and hate, I recoiled as I witnessed the images broadcast from the white supremacist rally in Charlottesville, Va. One photo, captured by resident Jill Mumie, shows a black police officer, head bowed and hands clasped, standing in front of a barricade as Klansmen wave a Confederate flat and raise their hands in a Nazi salute behind him. How do we respond to such evil?