Not quite what I said.
The value of the nuclear family for the development of emotional stability, cultural indoctrination, and the furtherance of general welfare is obvious. That it is aided by a decent family income, decent education, the presence AND involvement of two parents rather than one are supported in divers studies.
Strong ties and connections with the extended family or clan may make for a "stronger" family by multiplying the support system noted above. However, when allegiance/reliance on that larger version of "family" comes to supplant the need to partake in and support and/or sacrifice for the larger polity, then the larger society is undercut. When government service is viewed first and foremost as a way to enrich one's clan and one's power within that clan, then the larger collective (which could generate greater benefits for far greater numbers) is undercut.
If you look at the ethnic conflicts of central Africa and the warlordism of Central Asia, you will usually see the primary locus of cultural power being the extended family/clan....which may well explain their inability to get out of the "rut" they are in even more than the more fashionable emphasis on Western mucking about in their affairs.
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