I too called (and still call) the Black Falcons "Eagles" (as well as "Lions" for the Crusaders, "Dragons" for the Black Knights, etc.), but I will try to use the terms of our community to avoid confusion
. In addition to being the people of my original Signature Figure (as stated in various other posts), I thought of the Black Falcons as a sort of minority group, not as populous nor as powerful as the Crusaders or the Black Knights, similar to the Forestmen or the Wolfpack. (I can't speak for the factions introduced during my Dark Age.)
Come to think of it, in many of the faction vs. faction sets, the "good guys" and the "bad guys" are relative to personal biases concerning the factions. For instance (in my opinion):
Crusaders vs. Forestmen sets - Robin Hood's men are the good guys. In 6042, the Crusaders are ASKING for a Forestmen ambush by imprisoning a Forestman.
Crusaders vs. Black Falcons sets - In situations not involving my Original Signature Figure, the Crusaders are the good guys. Of course sets such as 6067 might show a kind of peace (if not alliance) between the two factions.
Black Falcons vs. Black Knights sets - I've always thought of the dragon as evil (due to indoctrination and propaganda and all that stuff), so the Black Falcons are the good guys. Or maybe the Knights of the Black Monarch were created to replace the Black Falcons as the major threat to the Lion Knights (who already had their hands full with Robin Hood's Merry Men).
Crusaders vs. Black Knights sets - The Crusaders are the good guys, or at least they are the home team (6060).
Now, as an AFOL, each and every side has their own motivation--their own "good"--as it is in "real life." Then again, the Dark Lord inhabits my Black Monarch's Castle...