All right, this is a fair point. But also consider that I don't think very many of the people they are recruiting in the Middle East have access to Western Media reports, and if they do, this is not what sways them into believing ISIS is Islamic. They believe ISIS is Islamic for entirely different reasons, and if you want to combat the perception of ISIS as Islamic, you're better pressed figuring out why poor people without access to Western Media are finding the violence of ISIS and their own understanding of Islam to be congruent.
The Israel - Palestine conflict also has a role to play in this. Poor people in the Middle East can empathize with the suffering of Palestinians. They naturally tend to rally behind any "strong" force which supports Islam. If there wasn't so much fighting and violence in the Middle East, I doubt if ISIS would have been as successful.