You know what? This is no different than saying the actions of bank robbers and rapists are just symptoms, not the disease. The disease is that they weren't happy in their childhood. We need to empathize with them.
No, we solve the problem of bank robbers and rapists with police action and methods.
ISIS is no different.
There's nothing smarter or wiser in pointing at or alleging to point at "True causes," "Deeper causes" and all that rot.