Why is true symbiosis extremely rare in the sphere of human cooperation? What informs this claim?
Because humans are basically selfish babies.
If I raise chickens and my neighbor raises pigs, we might agree to trade some number of eggs for some number of strips of bacon.
This is a nearly symbiotic (purely voluntary) relationship (as long as bacon and eggs are not considered necessities).
However, if a third neighbor also raises chickens and undercuts my bacon price, I have to pay more eggs to get my bacon.
The cooperation between neighbor 2 and neighbor 3 comes at "my expense".
Perhaps anarchy already exists and "THE COMMUNITY" is merely the highest manifestation of organized crime. – special thanks to 
@thoughts-in-time
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+proHUMAN +proFAMILY
Your scathing critique is requested.