Great question.
Have you noticed that Muslims, in their opinion, NEVER conquered anyone? They only "united the Islamic lands in different parts of the world around their natural center in Mecca". In Muslims eyes, if the Islamic troops enter the historical capital of the Jews - Jerusalem- it was, of course, for the sake of liberation of the Jews and other people who lived there from the unfair dictatorship of the Non-Muslim rulers. But if the Jews come back to Jerusalem - it is, certainly, the conquest, the invasion , and those Jews who try to live there are, without any doubt, the aggressors and “settlers”. And the simple and evident statement that the Jews are returning to the land which had been robbed from them by Muslims makes Muslims hysterical. Well, of course, the Jews have no right to return to Judea and the Israelis have no right for Israel! And the question why these lands bear the names Judea and Israel (the answer is more than obvious: they are called so because since the Times Immemorial they were inhabited by Jews and Israelis) immediately makes a Muslim frenzy and he starts to call you “ a Zionist” (he does not know exactly what it is, but he knows for sure (the Imam in his mosque told him so) that it´s something very bad and dirty, an insult, to put it short).
Muslims never accept they conquered some land or some people; in their eyes, it was "the liberation". Muslims were never guilty of genocide, massacres, rapes, racial and religious discrimination...
Any aggressor says that he is liberating someone and comes “to save the people from oppression”.