History's legacy created divisive issues between Palestinians and Israelis. Judea, home of the Jews in ancient times, was conquered by the Romans and renamed Palestine. Palestine was later conquered and inhabited by Arabs for over a thousand years. The Zionist movement arose to restore the Jews to Israel, largely ignoring the existing Arab population. Following the Balfour Declaration in 1917, Palestine was granted to Britain as a League of Nations mandate to build a national home for the Jewish people. The Arabs resented the Jews coming in to take their land. Led by Grand Mufti Hajj Amin El Husseini, they rioted repeatedly and later revolted, creating a history of enmity between Jews and Arabs in Palestine. Britain stopped Jewish immigration to Palestine. Following the Holocaust, in which 6 million Jews were killed by the Nazis, pressure on Britain increased to allow Jewish immigration to Palestine. In 1947, the UN partitioned the land into Arab and Jewish states. The Arabs did not accept the partition and war broke out. The Jews won a decisive victory, expanded their state and created several hundred thousand Palestinian refugees. The Arab states refused to recognize Israel or make peace with it. Wars broke out in 1956, 1967, 1973 and 1982, and there were many terror raids and Israeli reprisals. Each side believes different versions of the same history. Each side views the conflict as wholly the fault of the other and expects an apology.

Originally formed to regain all of Palestine for the Palestinian Arabs, the Palestine Liberation Organization signaled that it would accept a two state solution in 1988. The Oslo accords were supposed to have led to a peaceful resolution of the conflict, but continued Israeli settlement and Palestinian violence and incitement degenerated into open conflict in September 2000.
Source:
http://www.mideastweb.org/nutshell.htm

Some Arabs see the state of Israel as being on land that was taken from them by the British in order to create a modern nation that did not previously exist.

Because of the evil Zionist Movement.
Fact: Not all jews are zionist.

My 2 cents.
http://www.nkusa.org/AboutUs/Zionism/greatgulf.cfm

For one reason, they're tired of getting their asses kicked every time some raghead gets trigger happy. Israel doesn't take any shit from those raghead dorks.

Pride.

Muslims in general, and Arabs in particular, simply cannot accept the notion that anyone can kick their butts. After all, "Allah" is supposed to protect Her "True Believers" from the infidel.

And partially because one of the Muslim holy sites is the Dome of the Rock, wherein Mohammed claims to have gone to Heaven on the back of a winged horse.

The following website is a bit slanted, but then, so is any website that the Muslims quote:

http://www.masada2000.org/historical.html

Because of Christ Jesus. The world hates Christ Jesus.

because techinically the land was taken away from them to be given to their enemy. which was actually prophesied in the bible before it happened... the situation between these two groups has been fraught with violence pretty much since the beginning of time.

It`s on occupied territory. They want Israel to move to Alaska.

I don't think anyone knows why anymore.