An excellent article on the arguments used by ISIS to justify their jihad against:
...the primary target of Isil and similar groups is not the West. It is other Muslims. Above all, Shia Muslims.
Link:http://www.telegraph.co.uk/news/worl...fantasist.html

The full title and sub-title are:
Anyone who thinks Westerners are flocking to Isil because of the Iraq war is a fantasist; Isil and its jihadist ideology uniquely exploit underlying conflicts and offer the conspiracy theory solution: none of this is your fault.
On radicalization:
Radicalisation is complex phenomenon. There are as many reasons for radicalisation as there are radicalised young Muslims. Each one of them has their own story with a complex mix of reasons, more or less rational, for why they have come to have the radical world view. Nonetheless, we can also observe some strong patterns amongst those radicalised emerging from the increasing body of interdisciplinary research on radicalisation. For example, most come from unsafe, unstable social environments and have histories of petty crime, as well as drink and drugs problems. It is also notable that this tendency is especially acute amongst white Western converts. They may feel that their lives lack direction, but also feel disempowered and disenfranchised. They feel that they are not in control of their own destinies.
What an organisation like Isil offers them is instant reception. And moreover, a purpose. A direction in life.
Author's slim, UK bio:http://www.rai.ox.ac.uk/fellows/ibrahim