Seems to me (without thinking about it for very long -- take this all with a rock of salt) that your guy is looking for you to discuss the supposed hopelessness and despair of the oppressed muslim world. He wants you to buy in to what he says in his article -- that we shouldn't just kill all the terrorists, we should understand them, love them and stop doing the things that made them angry with us. That's why you look for "root causes" -- to treat the disease rather than the symptoms. So we stop oppressing these poor people and let them be. Ask questions about whether it is right for us to support Israel given its oppression of Palestinians. Ask about whether access to oil justifies our presence in the Middle East.
I would read his articles. Notice how he doesn't take firm positions on anything -- he has views, but he expresses them in a very wishy-washy, feminine way. Everything is in "how should we feel about this" format -- I'd try to mimic that a bit.
Oh, if it isn't already obvious, I'm just trying to help you get a good grade. I think all of the above is a load of &^$#.