That decision came after a decades-long debate that has recently intensified because groups such as the Ku Klux Klan began using the words and symbols of the Crusades, which were a series of bloody religious wars starting in the 11th century between Christians and Muslims.
That of course is a lie, as that was when the Europeans started to get serious and fight back against the Jihadi's, who started the wars in the 8th century. This short video gives and excellent presentation: