Hi, not discouraging more contributions, but just fyi, there are a few posts in the FAQ The Crusades | Cause and Motivation:

###Cause and Motivation

• Who started the Crusades? (Each one) by /u/Ambarenya

• What kind of specific examples/evidence exists to support the idea that the Crusades were motivated more by the prospect of collateral wealth rather than religious goals in the Holy Land? by /u/Medievalismist

• I saw this article about the Crusades posted on Facebook. How accurate are the bullet points? by /u/Valkine and /u/labarge3

• Were the crusades an inevitable event, or were they purely the brainchild of Pope Urban? by /u/thejukeboxhero

• Were the Crusades a defensive move? by /u/thejukeboxhero

Since the posts have been archived by now, if you have follow-up questions for any of the users therein, just ask them here and tag their username to notify them