The thing is that most people have a 'sunshine and flowers' view of world peace, where people of every race, from all walks of life, man or woman will join hands in a grassy meadow somewhere and sing happy songs on a lovely sunday afternoon with children playing nearby, allow me to pop the hippy bubble here by saying that is a complete load of bollocks and will never happen.
My view of world peace is more or less the world as it is, the main difference is that no-one is killing each other, we can still hate each other with a passion, we simply can't throttle the bastards (after all, peace isn't loving and tolerating each other as some may believe, it's simply not fighting each other).
Look at England and France, we used to more or less be constantly at war with each other (we even had the 100 year war, now that's dedication) but now this has stopped and we've had peace between the two countries for a long time (even though stereotypically there is still a certain level of antagonism between us).
We don't openly love each other but we're not poised to rip each other's throats out either.