wow I love how no body is thinking outside the box on this one.
so im going to reiterate what I said earlier.
world peace is possible.explanation;
If the government made a way to censor the internet and media which is possible maybe even now or in the near future the government could brainwash a majority of the country into believing everything is okay and then using advanced military technology to cover up any would be wars or unpeacful altercations.if there was no reason to hurt someone then people wouldnt do it.
plus we would need advanced medical technology to turn fatal wounds into scraping your knee on the concrete. if you couldnt hurt someone bad enough to permanently effect them people wouldnt do it.so in summary, if we were all brainwashed and pain wasnt a big deal "world peace" would be achieved.