Readers of this blog will be familiar with (and annoyed by) popular misconceptions about the crusades -- such as blaming the rise of the Islamic State on the alleged "atrocities" and "aggression" of the crusaders, or lumping the crusades together with the holocaust as one of the worst crimes against humanity in human history. Nevertheless, you may find the following concise rebuttal of common myths useful in your own discussions with people who have fallen victim to persistent misinformation.
2. The crusades were not wars of aggression. They were a response to over three hundred years of Muslim aggression in which invading Muslim armies had threatened Constantinople and nearly reached the Loire.
Whatever the reason, most modern references to the “barbarism” of the crusaders and the “atrocities” they committed are little more than rhetoric, yet they draw their inspiration from two "facts" that have been repeated so often that most people don't know the source but accept them unthinking.
— ought to appreciate and recognize that fact.