When Brabantio warns the Moor, "Look to her, Moor, if thou hast eyes to see; / She has deceived her father, and may thee" it is merely foreshadowing at this point and nothing more. Certainly, she had betrayed her father, but she has shown she is very loyal in the process also. Brabantio knows nothing of Iago's machinations and he even thought that it was spells and witchcraft that had stolen his daughter. Desdemona telling Brabantio that it was her choice probably just made him very furious. It cannot be argued that it was accurate or inaccurate-Brabantio was merely lashing out to assuage his anger.