It is a family feud that was hot four thousand year before the USA existed. It will only stop with the second coming! The core is Hate, and they will kill one another until they are all dead. Weapons are secondary, hate is the driver. It would be sticks and knives if they had nothing less!

As long as Saudi has oil money, they will fund those that will kill for their shared beliefs

When the USA pulled out of Vietnam, the real Vietnam died, and was replaced by a totalitarian communist government. I have friends from there that STILL can not visit family! One had his Family murdered....