The Crusaders ransacked and slaughtered non-Moslems all the way to Jerusalem and back..
especially the Jews and locals in Germany and other low country areas they passed through..
sometimes it was the strange new language, or a misunderstanding or just plain ruthlessness..
many “crusaders” never reached Jerusalem but decided they had already arrived when they got to an area somewhat different from their own...
and in Jerusalem anyone dressed starngly were identified as Sarasans and attacked accordingly...
and then there was that “Christ killers” thingy..
OTOH, knights were a pretty brutal bunch. Their attacks on the locals in Hungary and elsewhere weren’t greatly different from how they behaved at home.
“Private war,” which consisted mostly of ravaging the neighbor’s lands, was endemic in the feudal areas. Ravaging, in this case, being a euphemism for destroying the enemy’s resources by raping and killing his serfs and burning his buildings and crops.
That did happen one time there is no record of Richard the lionheart giving those orders and the men were punished for their acts.
Oh, boy! Here we go.
“...and in Jerusalem anyone dressed strangely were identified as Saracens and attacked accordingly...”
True as it went, but the reason Jews & Christians were indistinguishable from Muslims in Jerusalem was the Muslim overlords’ forcing people of all faiths to dress according to Islamic fashions.
The Crusaders breached the walls & found (all men at least) wearing caftans & turbans & they assumed (wrongly) that all were Muslim. The slaughter that ensued was inexcusable, but war is h*** sometimes.
And without the Crusades, Europe would have succumbed to Islam.
History can be complicated.