ISIS's overt strategy is to antagonize the west into over-reaction, because they want things so polarized that the bulk of Arabs have little choice but to align

ISIS's overt strategy is to antagonize the west into over-reaction, because they want things so polarized that the bulk of Arabs have little choice but to align with them for survival. I don't know about these passports specifically, but it certainly is true that ISIS would benefit immensely from Europe and the west closing the borders to refuges.