Racism is a vital component of Islam and Islamic terror. It's why they hate the Jews so much as they believe themselves to be the Chosen people, but that is due to what they believe to be a special mission or covenant with God.
Muhammad took this idea and twisted it into a racist, conquering, intolerant ideology. And who defends Islamists with all of their might? That would be the liberals.
It is a racist philosophy — one where the word for Negro (abd) is the same as that for slave and one where in heaven, the righteous are made fair and the sinful made dark skinned.