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The short answer to you question is no.
And until we find some more effective way to kill/destroy mass amounts of people nuclear weapons will remain the most effective last resort weapon for the countries that stock them.
And while I beleive its possible to build a missile defence system I don't beleive its possible to build one thats 100% reliable. When launched in significant numbers some of the warheads will make it through.
And to answer you question about would the world be more peaceful if there were no nuclear weapons. IMO no, history makes that one pretty self explainitory.
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