Well to us, we're replicating the "deeds" of the 12 zodiac braves. But there's two sides to every coin, and perhaps to the beastmen, the "zodiac braves" were the Lucavi. Malicious, genocidal war criminals that slaughtered them in droves. I'm sure the human race's "Twelve" are akin to Primals to the beast tribes. The overarching "theme" of FFXIV seems about everyone thinking their god is tje true god, including the player characters. And i think the message the writers are trying to instill in us is to break away from religious dogma and all mortals to live in peace. And to worship "gods" is folly because how can an immortal being relate to the struggles and pain us mortals have.