And he can tell people to drive safe, don't get angry, don't kill anybody and that will really stop them. After all he did tell the Syrian government to stop shooting protestors. You can see how that worked out.
The middle east problems are by two sides not willing to discuss differences but rather hurl accusations at each other. Most of the problem is not recognizing someone elses right to exist and wanting to wipe them from the face of the earth. How can anyone negotiate with mentality like that? Telling someone to give up ground at a negotiating table when the other side wants genocide is well just plain stupid.