Note that there was about 9 centuries between the Umayyad conquest of Iberia (8th century) and the explulsion of Moriscos (17th century). So the analogy with North American natives would be something like - if somehow the Native Americans win political/military control in the 23th century (9 centuries after the arrival of the Europeans) and then decide that all non-native Americans will have to leave the country to wherever their ancestors came from - do you feel that would be justified?