Violent extremists who are killing children and others in Iraq, Syria, Nigeria and other parts of the world may cite Islam as a justification, but the West should be careful about calling them Islamic radicals, Secretary of State John Kerry told an audience of opinion leaders Friday at the World Economic Forum. In a speech calling for a global effort against violent extremism, Kerry said it would be a mistake to link Islam to criminal conduct rooted in alienation, poverty, thrill-seeking and other factors. …