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My question is,
Why is Nationalism ok ?
Nations are ideas. Different ballgame than race.
A bad sportsman has all the support from his country men but why ?
Being proud of one's country and its accomplishments is perfectly fine. It's when you start to say that only your country is the best and every other one is crap that the problems start.

but i'm talking about Nationalism.
A bad sportsman has all the support from his country men but why ?
This. Racism is negative and destructive, but Nationalism/Patriotism can be a uniting and positive force for a nation. There's nothing wrong with being proud of your nation.Being proud of one's country and its accomplishments is perfectly fine. It's when you start to say that only your country is the best and every other one is crap that the problems start.
That's 'authoritarian nationalism' though which requires absolute loyalty and obedience to the state and is only interested in the good of it's own state/country.Nationalism is one of several defining characteristics of Fascism. Corporatism is another.
Correct me if I'm wrong, I think the analogy in the OP is meant as in:
Racism consists of considering (and acting on) a set of people, here defined as belonging to a same "race", to be better than another set of people from another "race".
Nationalism consists of considering (and acting on) a set of people, here defined as belonging to the name nation, to be better than other sets of people from other nations.
In this thinking the two things are not dissimilar at all... yet one is deemed unacceptable, while the other is socially accepted when not even promoted...
