I would like for the British Government - in a heavily controlled manner - to dispose of any nuclear warheads in the United Kingdom's possession, and encourage other nations to do the same, in order to promote world peace and to eventually create a no-nukes world.
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This is because such notorious weapons only bring death and damage, being in support of such devices can only support murder and annihilation of everything we love. They are sources of evil and only evil, no good can come of using nuclear weapons.