I know this sounds like a vague idea, but sometimes i think in the possibility that we all live inside a huge organism. I noticed similar patterns of behavior in the atomic structure as in communities as in the galaxies. Each atom has an atomic nucleus excercing its gravity upon the electrons surrounding the nucleus, just like the planets attracted to the sun's force of gravity.
The closer the electron is to the nucleus, the harder it is to pull the electron out of the nucleus' force of gravity. The same concept can be applied to communities: The closest the person is in relation to the community, the harder it is to pull the person out of the community. Thus, a person with no close relation to a group is more susceptible to separate from others and find another group, like the farthest electrons to the nucleus which sometimes these are transferred to another atom or shared with other atoms.
It would be kind of funny if we lived inside a giant animal, like a huge dog or cat for example. Still there may be the possibility that this is the case. But who knows?