Patriotism is national self esteem. Without patriotism, there is no sense of identity and pride, there can be no extension of the national competence and strength. Social collapse then is inevitable.
Patriotism begins as a noble virtue, pride in one's nation, devotion to its welfare and loyalty to its government. It ends as vulgar vice, its propaganda whipping up inhuman images of enemies and inciting war and the manipulation and exploitation of its non-rational elements lead to demagoguery. It is used to sanctify racism, sexism, anti-unionism, profits, witch hunts and bigotry. As Samuel Johnson said in 1775, "patriotism is the last refuge of a scoundrel".