It is easy to dismiss children who march. It is easy to drown out their voices in adult condescension. It’s even easy to portray them as damaged puppets in the hands of shadowy political masters. That’s what the other side said in Birmingham. That’s what the other side said in Soweto. But the children who spoke on Saturday know more about gun violence than any of the smug voices telling them to shut up and heal. So dismiss them, if you must. History will laugh at you one day.