I'm not rewriting history, I'm separating the state from the religion. Yes, the Islamic empires were built with the military. After a state was conquered, there was usually not the forced conversion common in Christianity. Hence Lebanon containing Christians throug a millennium of Muslim dominance.

The Spanish case is not different. Much of Spain had been Muslim for as long as it had ever been Christian, and the Christians had been part of the empire for centuries. The expulsion wasn't an ancient grudge over being conquered, if it was then they wouldn't have also forced the Jewish population to do the same thing.

Oh, and if Spanish aggression was justified, colonialism justifies the current aggression in the Middle East.