RAQQA, Syria — The self-proclaimed Islamic State has issued a statement condemning self-proclaimed comedian Kathy Griffin, accusing her of “cultural appropriation” after she posed for a photograph with a mock severed head of President Donald Trump. The group, which has been protective of its brand ever since taking over vast swaths of Iraq and Syria and establishing itself as the premier beheading agency in the Middle East, said it was deeply disturbed by Griffin’s “ignorant and offensive” use of a “sacred Islamic State tradition.” “This is just another example of a privileged white woman culturally appropriating the proud custom of...