I would assume that many are like some people that I work with. They are 1st or 2nd generation US citizens that have moved back to Lebanon to either get in touch with their roots, or have become wealthy and moved back to live in their country of lineage. I know people from both sides of the fence in this one.
Funny enough, I know of some Syrian and Lebanese nationals who work with, and are vey close friends with, a number of Israeli Nationals. We have many Middle Eastern folks working at my company. Seems that many that embrace American culture, values, and freedoms, seem to be able to get over the religious gap and respect others.