Could some of the sabre-rattling going on in the ME have to do with the water shortages? Although the people may not realize the severity of the situation, there's a good chance that the leaders of these countries do. And those leaders would recognize that when the water shortages become severe enough, they could have a LOT of angry people beating at their doors. Militarism is a good way to keep attention directed at something else.
Israel provides the sole exception to this regional tale of woe. It too, as recently as the 1990s, suffered water shortages; but now, thanks to a combination of conservation, recycling, innovative agricultural techniques, and high-tech desalination, the country is awash in H2O (Israel’s Water Authority: “We have all the water we need”). I find particularly striking that Israel can desalinate about 17 liters of water for one U.S. penny; and that it recycles about five times more water than does second-ranked Spain.