CEP Senior Advisor Edmund Fitton-Brown writes: The West is often accused of "double standards", whether in the field of human rights or foreign interventions, environmental targets or nuclear proliferation. I have had to answer this charge with monotonous regularity throughout my diplomatic career in the Arab World and my five-year stint with the United Nations. The accusation that concerns me here is that we have no moral right to prevent countries like Iran from seeking a nuclear capability when Israel has had nuclear weapons for at least half a century and is not a signatory to the Nuclear Non-Proliferation Treaty. Why are we not trying harder to challenge that? Surely we should insist on the whole Middle East becoming a nuclear weapons-free zone? And, in any case, how can we be so sure that Iran doesn't simply want nuclear energy for peaceful, civilian purposes, as it says it does?