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ICBM might become ineffective due to advances in missile defense technology, but other delivery means still exist. Sneak a cruise missile through. A suicide bomber with a suitcase? Something else will come along that we haven't even thought of.
The 2nd question: no, removing nukes would actually be worse. Tally up the number of dead through warfare from beginning of civilization right up to WW2. Tally up the number of dead after WW2 until today. Take any era. I can bet that the number of dead was actually greater as a percentage before the introduction of nukes. The number of major wars between nation were also greater. The world today is the safest it has ever been. Yes, there are sufferings around the world. But there were sufferings, much greater in number, before WW2. We just don't see it on CNN/Fox/BBC every single day, 24 hours a day, 365 days a year. The perception plays a great role here.
This world is fairly stable. Like it or not, USA playing the world police, arrogant maybe, is necessary to maintain some semblence of order.
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