ISIS propaganda needs to be curtailed, but then how does one go about it? they are everywhere - facebook, twitter, social media, youtube, they are publishing sleek magazines now.
The second part - I believe they are getting recruits from all backgrounds from developed countries too, they are calling for doctors, engineers, consultants, tech guys etc now. Plus the affluent Muslim is more in a position to make that hijrath to the caliphate, while the poor one's become potential trouble makers at home.