I don't think this logic applied to humans actually is inaccurate. For much of human history, extended family cohabitation was the norm, and the standard American nuclear was a radical, almost unimaginable idea. Most animals operate on a biological impulse to further their offspring; do most animals operate this way to pursue immortality and evade death?

I don't see anything inaccurate with this base level analysis, although it obviously elides most of the finer elements of human existence that exist a bit higher up on Maslow's hierarchy.