I believe that the army should exist because if one country got rid of there army and the rest of the countries didn't follow that one place would be the 1 ugly duckling and could be invaded and destroyed at any time but also as we all know not every country would give up their military anyway.
Funds used to promote the military can be utilized for research and advancement of science. Not only that but we could use them for education, healthcare, infrastructure, and public attractions such as museums. This makes us think, should we perpetuate violence for who only the rich benefit? War destroys humanity.