“Perhaps they had decided they did not have it in them to do what would have needed to be done, to corral and bloody and where necessary slaughter the migrants, and had determined that some other way would have to be found. Perhaps they had grasped that the doors could not be closed, and new doors would continue to open, and they had understood that the denial of coexistence would have required one party to cease to exist, and the extinguishing party too would have been transformed in the process, and too many native parents would not after have been able to look their children in the eye, to speak with head held high of what their generation had done.”