@WandererUber @Waldbrand Yeah, I'm a former AnCap.

Basically you need a way to expel groups that are acting together to the detriment of your group. Organized warfare is easier on a state level (see the Roman conquest of the Celts, for example), but even if we grant that AnCap societies could enrich themselves to the level of being superior militaries than States, you would still need some way of getting rid of organized "crime" in a way that doesn't invalidate the premise of being AnCap.

Basically if they can tailor their aggression to just below the threshold of being "aggression", they can still attack without a response.