Fact is... Palestine and many Islamic nations calls for the Genocide of The Jewish People and the state of Isreal.
Why havent they followed through? You can thank the 6 Day war where Isreal kicked every ass around them in 6 days. Why did Isreal do it? You should really learn about this stuff it is important.
Egypt, Jordan, Syria all conspired to Invade Isreal and were on the brink of acting on it. Armies were at the border of Isreal on all sides and within hours of Invading Isreal The goal? Kill every Jewish Person living in Isreal.
YOu can learn about the 6 Day war here:
http://en.wikipedia.org/wiki/Six-Day_War