The textbook intentionally deprives students of the means to address the questions posed by presenting only very superficial arguments and filling in the void with the idea that each side has a valid point of view. It teaches nothing. It shouldn't require an interested group, such as the rabbi mentioned here, to point this out, But at least someone is. Most people these days woundn't have a clue one way or the other, and textbooks like this one keep it that way.
To answer its question, I'd suggest studying the history of Islam towards other peoples, whether Moslems ever did anything without the sword. Any time moral equivalence or superiority is claimed, all one needs to do is look at and know the other side.