Not only the crusades. Inquisition, St. Bartholomew's Night, Mallēus Maleficārum and other iniquitous things done in the name of God. I doubt non-secular educational system will find those a righteous thing to have been done.
As for the crusades, one whose favorite book in the History of Crusades by Steve Runciman doesn't need any threads to try to sway him this way or that in that matter. The thing that impressed me most was that Arabs were most liberal to pilgrims (with singular exceptions when a religious fanatic ruled the Fatimids) and Outremer Christians were allowed to pray their Gods. Moreover, most of the latter were Orthodox, and they openly resented taking their temples by Latin church warriors. Eventually, local Christians ended up being much worse off when ruled by Christian monarchs of Outremer than they had been by the infidel. So the initial premise of Crusades as liberation movement was fallacious from the outset - and ended in a failure.
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