because we give the Israeli's $50 billion a year. If he says no, oh well good luck surviving on your own. Not to mention that there are plenty other ways to pressure his government. Bibi's only way out right now is WAR (with his northern weak neighbor of course), but he even can't go to war because he doesn't have the green light from Obama. Therefore, do what we tell you to do or else...
We want Iran cooperation, not meddling, Gulf Arabs tell Kerry (Reuters)
from the article: Peres: We want U.S. ties to return to positive state