Neser Boha
upgrade your gray matter
Could it possibly be something very simple?
jus askin
Yes, it actually is.
The short answer: It's the historical imperialism/colonialism.
Just look up what UK, France, Russia, US, etc. did in Middle East and you will understand why it's such a hotbed of extremists ... it's really rather logical and doesn't take a genius.
The most immediate cause of what happened in France specifically - their involvement in fighting IS in Syria, the IS says.
Not trying to justify anything here, btw. I hate the fucktards and want them all dead - one and all.