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Garuda returns in Final Fantasy XIV as the Primal worshiped by the Ixal, and is known as the Empress of Birds. It is said that in past ages, Garuda slew the malevolent Lord of Snakes to end his foul attempt to bind the world’s creatures to the earth. Though birds became free to roam the skies, Garuda was terribly wounded by the battle and was forced to feast upon the snake's carcass to recover her energies, said to have since then a taste for the flesh of land-bound mortals.
This snippet came from the final fantasy wiki for XIV. I have also read other primal lore that some are not so corrupt. Like Titan. As long as you don't wrong him he has no issue with you. Also tending to the kobolds as if he was a father figure. If we look at it from the aether use then white mages,(think black mages also), and crafters are evil since the use of it takes heavy amount from the planet. Hence white Mage was the cause of the ending of an era.
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Good King Moogle Mog is not evil, he sacrificed himself to let the Moogles escaped their previous homeland destruction. Then thousands of years later when he finally reached the Moogle new homeland (The Shroud), he immediately encountered Garleans bombing and burning it to the ground. What do you think he would react? Kill all the human!