True, he may have been disgusted with the actions of his race, but that was more toward the actions undertaken during the Dominion War, and not the Occupation. (I just rewatched the scene, it's admittedly been a while since I'd seen it.) He seemed more upset that Cardassia had caused its own destruction by allying with the Dominion. He was angry at the loss on Prime, and that Cardassia would never again be the Cardassia that he knew. He's frustrated and he's grieving.