You could roleplay as an evil character. As an example in Duy Finder ^^
The beastmen do the same thing with common people.
And the empires idea about what is good for Eorzea was "let a moon fall on this"
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I want to be with Gaius so bad :(
If Gaius is here none of this will happen.
'I can be as rude as I want! I'm a villain!'
Evil is perspective, I wouldn't mind a side who greatly differs not only in perspective but in actuality (actually blood enemies), but I think we're way too far into the game cycle for that to be even a semi-safe addition.. Yoshida would really have to be into the idea in order to take that significant risk.
Still, would be fun from a lore and experience point of view - I would like to see the Garlean city :P.
To have some one truly fit the role of "evil" there would probably need to be a new MQ line for people who side with the garleans as a GC'esque group. Down side of this is no concrete lore moving forward.
Would be cool to see a Garlean separatist group acting as a 4th GC or similar to a beast tribe(perhaps founded by Cid?) that accommodates the desire to wear the imperial magitek style armour/weapons.
Besides, evil is subjective. I doubt Garleans loyal to the empire think they're evil.
I feel such an option would completely water down the stories overall. Either you get a never ending story of bad guys vs good guys for the sake of having something to fight against or you wind up separating the player base into factions and makes duty sign ups an even bigger pain in the butt; thought DPS queues were bad? Now split that into two factions trying to get their quests done!