In the last 10 years a plethora of phych and neurobiology studies have come out of the British medical community trying to understand why some individuals seek belonging to a group, clan, village, country or nation. While others reject the concept. I suspect the less than homogenious population demographic in Britian these days is driving these studies in an attempt to help maintain public order.
The biological conclusion all of the studies agree upon is the inherit differences between Left brain dominance and Right brain dominance.
Left brain dominant types tend towards strong in-group affinities, religiosity, securing the future with children and cooperative self regulation. Group, village, clan, religion, buisiness, militairy, country, nation and history.
Right brain dominant types tend towards novilty seeking, low birth rates, degrees of narcasissm, drug use and rejection of religiosity. They do not affiliate as strongly to any type of group as much as they are in a constant search for novel input and experiences in conjunction with groups. Actors, entertainers, artists, college professors, activists, anarchists, tree huggers, whale savers, save the worlders, social workers and so on. Personal identity versus religion or history.
About 35% of a given population tends towards left brain dominance with about 20% right brain dominace. The rest are a spectrum in between. This is why moderates often determin the fortunes of politicians in the west during elections. Or in the past the group described as the "Great Unwashed Masses".
Novelty seeking drives the constant request to eliminate side switching restrictions regardless of the consiquences. Group(country) loyalty is why many players are ambivalent about changing countries versus belonging to something for the long term. Statisticly the number of novelty seekers is smaller than the side loyalty players.
Let the novelty seekers jump sides every 60 minutes for say 75-100 fighter perks.
Another interesting trait found with novelty seekers is that conceding to their wants is not the end of the wanting. It's just the end of that novelty. The novelty seeking trait is essentialy it's own self reward process what ever the outcome. Boredom is emotional death to the novelty seeking causing them to seek entertainment elsewhere much sooner than their counter part who tends to stay with their chosen loyalties far longer.