Actually it is very easy to attain peace; however will power is required for that and Hazrat Mahdi (pbuh) is the one who will provide that will power
Excerpt from Mr. Adnan Oktar's Live Interview on A9 TV dated September 22rd, 2011
ADNAN OKTAR: Actually, things are not all that complicated. People make it unduly complicated. There is nothing complicated about Israel living at ease in the region; that is an easy matter. But they portray it as difficult. It is not that difficult for the Arabs to live in peace, it is not difficult to prevent war in that region either; but they make it very complicated. Yet it is very easy. There is nothing that one cannot understand. They will live as friends and brothers, and just have to eliminate any feelings of hatred and enmity. The spirit of conflict must be eliminated and everyone must genuinely renounce their own rights and eradicate that anger inside them; they must live in peace, as friends. But that calls for will power. People are unable to come by that will power as a community, as a collective personality. It is essential for there to be a leader. There has to be a brain in charge so they can do this. They cannot do it so long as there is no such brain. The name of that brain is Hazrat Mahdi (pbuh). The result is anarchy when there is no one brain at the head of the humanity, but a many-brained body instead. Then the body turns cancerous. For instance millions of brains; they all push in different directions. The body cannot act as one. But if you have a big body with a single brain; for instance if a body of 1.5 billion people is bound to one single brain; then that body can act very easily. But if a body of 1.5 billion members has almost 1.5 billion brains, the body crashes. I mean, imagine someone with many brains, a hundred brains. One brain will tell him to go out while another tells him to stay indoors. One will tell him to eat something and another will tell him not to. One will tell him to sleep and the other will demand him to wake up. What will happen to that body? The result will be anarchy. The body will start to turn on itself. Cancer will be formed. That is why cancer grows in society. Cancer is forming in the Islamic world, in the world as a whole, and people are finding themselves at an impasse. This is why Allah sends the Prophet Jesus the Messiah (pbuh) to the Christian world in order to eradicate that cancer and Hazrat Mahdi (pbuh) to the Muslim world. So that this unrest, this corruption would come to an end, and they would be connected to one single brain and thus live at ease.