Doesn't sound like you have good odds there...
It's worth a try at least.. I paid ~$850 per ticket, so if there's a chance of getting half of that back and rebooking on a non Arab airline, I'll give it a shot.
Disputing on what ground? I don't really think you can win this dispute nor should Chase allow you to win.
On the grounds that the country is becoming increasingly hostile to Jews. I don't see how it's much different than return protection. I made a purchase, and that purchase now wants me dead, so I don't want it anymore.