My point is that, for all we know, the "openness" of the Mycenean Culture may have actually hastened its demise, and taking dead civilizations as exemplars is a tricky business.
Regards,
The Mycenaean, Hittites, Assyrians, and Egyptians were in a Golden Age of trade and relative peace when the Sea Peoples (possibly the ancestors of the Palestinians) started their raids and invasions, causing the fall of the Mycenaeans and Hittites, and greatly weakening the Assyrians and Egyptians. These Sea People created the Philistine state (and possibly Carthage) that has done nothing but cause trouble for 3000 years.