Mass destruction weapons were mainly used during the World War II where two atom bombs were thrown in the cities of Hiroshima and Nagasaki (Japan) by the United States of America. The nuclear bombs destroyed the cities completely and caused the death of lakhs of people. The effect of these bombs is still in the soil of Hiroshima and Nagasaki even after more than 70 years. What I feel is if the United States had not thrown those atom bombs, then maybe the war would not have ended and some countries would have completely vanished from the world map. Much more people would have died and millions of children would have become orphans. So, I think that it is not necessary to completely ban mass destruction weapons. The nations of the world need some weapons for national security and for the welfare of the world too. The biological and fully autonomous weapons must be completely banned as these weapons are just used by terrorists for harming people and no country would want an epidemic ...