Quote Originally Posted by Morningstar1337 View Post
He started the Dragonsong War as an eternal revenge plot for that Ishgard did to him and Ratatoskr, I wouldn't put it past him to hate humanity for what the Allags did to Bahamut and Tiamat as well.
Its just during one of the Flashbacks he says something along the line of that he said the mortals couldn't be trusted and they would betray the Dragons.