Is Nuclearr Wepons are needed?

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In this modern world wvery nation is trying to prove their status in the world. They use to tell show theirselve only by the nuclear weapon. My question is Is nuclear weapon needed. If nulear bomb explodes assume that if there is conflict between two nations and if they go for the nuclear bomb then what is the output? The output will be only many loss of people. Is this nuclear weapon needed for the wars. I do not say that we should not completly stop the usage of the nuclear weapons. These nuclear weapons are used as a alternative source of energy. So Is nuclear weapons are needed???