To liberate them from Cersei? I guess Dany didn't have a very good propaganda machine which is odd considering that she had Tyrion, Jon, and Varys. I guess they didn't think about that. Bleh.I know that the world Tolkien crafted wasn't all sunshine and rainbows, but those dark moments in The Lord of the Rings served as gripping challenges that made our main heroes' triumph over evil all that more fulfilling, instead of serving as a way to shock readers.
Being seen as a liberator made sense in Essos, where a large amount of it's culture is built on slavery, but why in Westeros?