Many are surprised by the seemingly 'craze' of ISIS or they seem to work overtime to prove their propaganda enemy is correct:

Some facts:

1)Big majority of Arabs are sunni muslims. Its unshakable and they'll never give up their identity. Burqa is an advertisment they'll not change nor be assimulated when they live in kufir countries

2)Like most normal people, the avergae muslims, particularly those who live in developed europe and US just  want a  job, family and good life besides their identity. But militancy is always latent among even the more moderate muslims.When life get tuff, many of the moderate muslims will become radicalised 

The 2nd point is exactly what the ISIS want to exploit, ie they want the kufirs to hate muslims, trigger wide spread anti-muslim riots, radicalise the moderate muslims and threatens WORLD JIHAD I  That's exactly what they're working on.

The west might try piecemeal attack on the ISIS but in the minds of the ISIS honchos it wouldnt work, the worst would be the ISIS boys disbanded temporarily and melt back to the arab popn mass. It'll be drain on euro and yankie resources and they bet the kufirs will eventually come to term and retreat and let them take over the middle east, just like vietnam(if vietnam is a headache for china, ISIS is obviously a headache for iran, happy?)That's what the ISIS hope for re-establishing the islamic empire but I  think it'll fail bcos:

1)Actually militarily the ISIS is no big deal, a few nato mechanised brigagdes which wouldnt mind killing civilians collaterally can root them out

2)Oil is gradually becoming less important for better or worse.Consider the popn growth&economy of the coming islamic empire

3)Too much wishy washy delusion like Allah is on their side