I think the underlying reason is that unlike people with Christian European background, who have got educated in a way that they know their own kind did not always did the right thing and sometimes behaved unfairly to others, Muslims think that they always are the victims.
For example in schools in this country all children study about colonialism (bad Europeans), slavery (bad Europeans), crusades (bad Christians), Inquisition and what happened to Muslims and Jews in Spain (bad Christians). While not many Muslims know about spread of Islam by force, elimination of Christianity from the centre of Eastern Christendom (Constantinople), African slaves brought by Muslim traders.
As a result there is a victim complex in many Muslims when they look at the history and see Islam as “peaceful” religion while thinking about Christianity exclusively as invaders.