Simply saying this.
Shinobi Legends isn't a RP site.
Its a game first and a place for RP second. Anything added into the game can be beneficial for roleplay, but the fact remains that SL has been, and will always be, a game, RP is just a sideline you can do when you're tired of leveling for now.
Good, evil. Its makes far more sense than ANBU attacking people just because they're from another village. It would be like hosting the chuunin exams. Shall I become an ANBU and slaughter all the senseis and genin for joining the chuunin exams, for they are visiting? Make logical sense out of this; Suna and Iwa would attack each other on sight, thats because of their history. That is -not- the case for Suna and Konoha. However, to incorporate that into roleplay, you'd have to add in Village Masters/Kages in the actual game itself to change the event of what villages ANBU attack and who they don't. Which is stupid.
Good and Evil is such a more simpler and better means. No fancy coding with village alliances, no silly 'everyone hates everyone' gimmick, if the village is generally good, the ANBU will ward off evil ninja whom would threaten the village, and evil villages would repel the good ninjas that come due to their nature.