that's a nice thought. but,we are dealing with human beings.the greediest,most willfully ignorant,short sighted,talented,loving,artistic,creatures that ever walked this planet. we seem not to have matured enough as a species to be able to accomplish those things,Yet.
no, because life doesn't work that way, no matter which way you slice it, in purely philosophical terms, until the glorious return of Christ, there will always be good, and there will always be evil, and they will always be at war with each-other until the other is destroyed. Until then, we must have the courage to fight against the evils and injustices we see. Though I'm sure the UN might try to ban war, it would be impossible to enforce.
War is something humans can't help. Ever since we've arrived at this planet there has been war. Banning things only promote them. We can ban war but war will still happen. Peace in the whole world is so precious and rare that I doubt we will ever find it. Whether it is over territory or greed, there will always be war.