Cognitive Dissonance is my best guess. You see the same behavior in Piece-of-Shit Christians, when you show them that they have an evil, ignorant, violent, misogynist ideology.
Look at ANY violence in North America, and you will find a Piece-of-Shit Christian. Either they committed the violence "for god", endorsed the violence or engineered the violence. Sometimes all three.
In Europe, its Piece-of-Shit muslims. They can't talk about muslim rape gangs without being called "racist". Yes, Britian has Muslim rape gangs!
http://www.gatestoneinstitute.org/5386/british-girls-raped-oxford
Been screaming about it since the 1990's. Nobody listened, and I was a "racist". The Piece-of-Shit muslims turned themselves into a "race" just like the Piece-of-Shit Jews did in the late 40's.
Now all that's left is to make Piece-of-Shit Christians a "race" and the world will be back in the dark ages.