“Talking about morality in a class about nationalism is sort of like talking about modesty in a swingers club or moderation in a crack house.”

John Faithful Hammer

Absolutely brilliant observation!

I haven’t tried swinging but I imagine that each of the participants does exert a certain form of ‘modestly’, otherwise they would be rapidly kicked out by the rest.
Similarly, no crack addict would survive even his first ‘session’ without being actually ‘moderate’.

As for ‘nationalism’… well, there is nothing wrong when people stick together in an attempt to lead a decent life, in close cooperation with the other nations.
Nationalism becomes dangerous, a.k.a. immoral, only when the people promoting it attempt to lead a (more) than decent life at the expense of all those who happen to live around them. The ‘funny’ part being, of course, the fact that this kind of nationalism invariably leads to tragedy. Mostly for those foolish enough to ‘swallow’ it, but not exclusively.