Comment by lo_zamoyski

Your examples are bizarre (sports teams are a matter of petty entertainment, not proper objects of loyalty). Philosophy isn't an object of loyalty either.

However, you should acquaint yourself with the principle of subsidiarity. Loyalty, duty, and love radiate outward from those who are owed the most diminishing to those who are owed the least (spouses, then children, then parents, etc., all the way through extended family and then community and nation and finally the human race). The loyalty is to the objective good. How that is expressed will be modified by contingent factors particular to a given person's situation.