So I guess ISIS appeals to the ones who would rather go out with a bang.
In the world of an RPG why does my character go off and become an Adventurer instead of living a quiet, humble, out of the way life?
In that fantasy world the normal quality of life isn't that good, and if you're just sitting around you're probably going to be picked off by some a-hole before natural old age.
In that fantasy world if you go out and TRY to have adventure your hard work, blood, and tears usually result in a better outcome. You did good, you get good rewards.
I think the real reason our society feels so vulnerable to 'radicalization' is that there is a distinct breakdown in 'the dream'; in the belief that you can put forth work and actually be rewarded. Or even in the ability to take that risk without starving/growing ill and ending up in a poverty spiral.
The people demand fulfillment, and meaningful lives; they want dignity and respect for their contribution to the whole.
I don't think it is a coincidence that engineering students are both far religious than science students, with the exception of software engineers. Last I checked something like 90% of structural engineering students were religious, while only like 10% of physics students were. ISIS claims to have all the answers. Liberal/progressive ideologies readily admit to a world without solid answers. The former appeals to the engineering mindset far more than the latter.