Published at 21:04 on 3 February 2015
Basically, they are dead set on pissing as many people as possible off, and their ideology prevents them from being able to acknowledge this. So they’re doomed to gather increasing numbers of enemies, and increasingly provoke said enemies, until those same enemies feel compelled to crush the Islamic State. It’s precisely the same reason why Hitler was doomed to fail.
A look at their English-language magazine should be enough to convince one of that. It’s packed with rhetoric about how what they’re doing is God’s will. So any criticism of their aggressive expansionist doctrine amounts (in their eyes) to criticizing the Almighty, which is of course a capital offense according to their ideology.
And, unlike with Al Qaeda (a non-state actor), war will be possible to wage against the Islamic State. It’s an actual nation-state (albeit not an internationally recognized one). It has an identifiable territory which can be attacked, invaded, and conquered. The well-understood concept of war can be easily applied.
And what sort of state is it? A landlocked one, in control of a badly conflict-scarred infrastructure, surrounded by nations which hate it. And which it is fated to provoke even more.