As someone who has played TOR... You can be Lightside or Darkside on either side of the war. Being good or evil on either side is a might bit different. My Dark side Republic character typically winds up being pragmatic and a little heartless, but ultimately does what they feel will do the most good, by sacrificing the least lives. My Darkside Imp is a Gleefully psychotic murderer of women and children, not presented as doing it because they're hurting my side, but because they're present and I have a flamethrower. My Lightside Imp is an honourable warrior fighting for monsters, while my Lightside Pub is practically Captain Freaking America with a lightsaber.

In regards to FFXIV... The Garleans can't really help us unless the Ascians pretty much rip a hole into the void and we need numbers. Till then our true enemy is fighting a proxy war using one patsy after another. An army is less than helpful here.