Let's pretend I agree with you that this was the case with all of the Greek city states.
You think the elevation of warfare as the supreme good is to be admired? It's to be admired in their culture even when it's completely hypocritical? In this scenario, the culture believes that the fact that it can, through the use of arms, enslave other people makes them superior, and the vanquished inferior.
You don't know where that leads? It leads to things like the Lombard laws creating a permanent underclass. The same thing can be seen in the Anglo-Saxon laws about the Britons. Ultimately it leads to Nazi ideology.
That's an absolutely amoral and disturbing view, imo.
Plus, I think it's incorrect. There was at least one culture in Greece which believed these things: Sparta. Great warriors, but practically illiterate. Give me Athens every time. That's the tradition which created western culture, which produced philosophers, doctors, scientists, poets, playwrights, and on and on.