[lupatus]

Nations are literally and figuratively large families. For example, roughly 25% of the USA populace claim descent from the Pilgrims[1] - a small group of ~100 people.

Nationalism is simply having pride in your family. To "stamp out" pride in your nation means that you have to "stamp out" pride in your family. The family is the basis of Western Civilization[2], and if you destroy the family, you get a lot of very bad and unwanted things as a consequence (like mass welfare and a halt to scientific progress).

[1]http://www.nytimes.com/2001/06/25/us/not-quite-your-ancestor... [2]http://www.catholiceducation.org/articles/marriage/mf0060.ht...