There is an interesting theory that says most or all socialist governments until now have been essentially nationalist, using (internationalist) socialism only as a guise for their true (imperialist) ambitions. Indeed, if you look at the fate of militant socialist governments, particularly the authoritarian ones, many have transformed into outright nationalism: Soviet Union, China, Vietnam, Zimbabwe, North Korea and Burma fall within this category.
A lot of my mates said this back in the 70s and most of them were Marxists/Trots. My reposte (as someone normal who saw things as they really were) was 'why do you bother then?'

You know what, they couldn't answer, they hadn't a clue.

Intellectual masturbation in my view.