What is the social issue of world peace?

If the world was all peace it would be really nice, but the issue is people fight, graffiti, there are wars, pollution and more. Things die in water because people leave cans, food and more on the beach and waves wash it away and send it, people drop things on purpose outside because they don't want to throw it away, smoking is a addiction but the smoke pollutions the air into smoke. People really should start caring for the world and also recycling and there's a never ending piece of paper of what you should do and not do in your head.