One of the most pervasive aspects of exclusivity is in legal affairs, particularly as to copyrights/patents/trade-secrets. Intellectual Property Rights form the infrastructure for the market-driven global enterprise we now enjoy/endure.
The view that exclusivity is all vice is extreme because it clearly has mitigating virtues. The same is true for intellectual property: there's an excuse for it but excesses threaten our peaceful coexistence.
Nature/nurture balance analyses color our attempts to modify the effects of exclusivity on societal behavior (we don't necessarily want serial killers to roam about freely).
Gaining exclusivity enables a conjunction of exclusivists. As interconnection (and acknowledgement of interdependence) waxes, elitism grows more abundant and less tyrranical. If there are 10,000,000,000 of us intimately connected it's easy enough for us all to be elite!
In "Howards End" E.M. Forster furnishes the first phrases of the class system's dirge. It is possible for a shared elitism to triumph over exclusivity! "Only connect! That was the whole of her sermon. Only connect the prose and the passion, and both will be exalted, and human love will be seen at its height. Live in fragments no longer. Only connect, and the beast and the monk, robbed of the isolation that is life to either, will die."
Celebration of kinship takes over for guilty mantras of "Mine, mine!" to our mutual benefit. We become transformed by inclusion as our view of "what is" becomes imbued with others' deepest being. It is hard to attack an entity containing so many "hostages" as our cohorts become human shields against exclusivist ambitions.