Free countries are at war with the ideology of radical Islamism - failing to reconcile that fact will  only allow society to regress further. Anyone who sympathizes with ISIS is a threat to national security and should be detained and/or deported. There is no negotiating or reasoning with cowards who mow down innocent civilians based on some perverted religious belief. It's not a secret, look at every country in the world governed by Islamic law - no freedom of expression, no gender equality, no freedom of sexual orientation - it's not a function of cultural relativism, it's a function of advanced civilized society vs. regressive 7th century tribalism. Western countries did not evolve into the most advanced societies in the world by accident, cultural segregation is not "diversity" it promotes regressive divided societies but self-titled "progressives" fail to see the hypocrisy staring them in the face when defending regressive cultural practices under the guise of "diversity".