They are diffirent situations Ashmo. Premodern economies are largely founded upon violence, especially Europe during the end of the Dark Ages: due to the rather pathetic nature of domestic agriculture, the best way to get money quick was to run over to the next duchy and loot stuff.
The Crusades are the most dramatically overblown period in all of human history. The Turks where doing just as bad, and occaisonally worse, then the Christians where duing even in Jerusalem, and the Mamelukes who replaced them where also just as bad for the local populace.
The Crusaders where not 'demons', simply because they where not clearly inferior rulers then the Mamelukes and Turks, and because the entire *era* was dominated by similar violence.
Unlike Communism. It's pretty hard to argue that Communism and Nazism killed for any other reason then furthering ideology by any autogenocidal means at their disposal. No Christain sect ever killed 100,000,000 in a quest to industrialize, no Christian sect ever kicked out every inhabitant of every city and forced them to live off the earth to try and create a 'New Man'.
I think I read somewhere that around 10 million people died on both sides. Most of them non combatants.
All Crusades or the first Crusade?