"The important thing is for Israel to not stretch the truth" says former White House Counterterrorism Adviser Richard Clarke. "I have no doubt that Hamas had people in the hospital, and that those people had weapons. And no doubt there's a shaft that leads to the tunnel system. But you could do that in almost any building in Gaza...So the Israelis have to provide a lot more proof if they are going to win this part of the public diplomacy, the public opinion battle."