You received an honest, 'un-twisted', non-adversarial answer. It's simply costs Vs. benefits, for now. Your 'suspicion' is undermined by the simple fact that Israel could license/sell their desalination technology if the economics were there.

And would not their adversaries be willing customers and possible partners in peace for such transformative technology?

Your question sounds like so many emails that breathlessly exclaim "what the....substitute 'medical', 'pharm', 'oil', whatever industry you choose, doesn't want you to know about....", substitute the 'discovery' being suppressed.

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i dont expect an honest answer since the adversary twists everything

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