Well ISIS seems to have goals that can be broken, so breaking the caliphate in particular should be a priority. And crush their funding sources and propaganda network.
Some sort of demonstration of their fanatical devotion. Zealots like it big and public. After deciding this, you only need to read a passage the "original way" (that none else in power has ever done before for more than 1000 years), you you're set.
In the case if ISIS, pissing everyone off might also be a point. Since they have this yarn to crate the final battle.
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