text:  Aid groups had stopped delivering aid anyway because of security concerns, because of attacks from Hamas. Former Israeli ambassador to the U.S., Dr. Michael Oren, says it's not hard to see why the leader of Hamas is rejecting a ceasefire. Mr. Sinwar, the head of Hamas, believes that time is on his side. He believes that the longer he waits, there will be more pressure on Israel to agree not just to a temporary ceasefire, but to a permanent ceasefire and a total withdrawal from the Gaza Strip. Hamas wins. Game over. More from townhall.com.