Ancient Greeks regarded enmity, not just friendship, as constitutive of civic order

Evidence

Kostas Kalimtzis comments that ”Aristotle, and all writers in the fourth century, considered echthra or ‘enmity’ to be the signature trait of stasis’ (Kalimtzis, Aristotle on Political Enmity, 121). Stasis, “which is enmity,” was constitutive of the polis, according to Aristotle, who, however, emphasized the centrality of friendship and dedicated much more space to it than to enmity or even war. — Gil Anidjar, The Jew, the Arab, 1007