Nationalism has been responsible, the same as religion, the same as ethnicity or whatever you’re going to call it, for some of the terrible disasters of the 20th century. ((Creativity And Dissidence, Turning The World Upside Down Pt. 2)) So, my take is if it is done well, without any blood being shed, if people are so pushed to the point, as happened in the Southern Sudan, where the one said to break away, then they should be allowed to break away.