Quote from my reply #12 above:
The Crusades weren't "perpetrated", they were Europe's reaction to Islamic expansionism.Don't forget, until it was overrun by the Muslims the Holy Land was in large part Christian.
Furthermore, Europe itself was in danger of being overrun.
When it comes to the Crusades, the West has no need to apologize.
It is unreasonable to judge the actions of the 10th century Crusaders by modern standards of morality.
Since that time Cristianity went through the Enlightenment and the Reformation and consequently Christians don't generally act like the Crusaders of the First Crusade anymore..
The same can't be said of the Mohammedans.