It is not so difficult to figure out why there is always such violence between Muslims and Jews, provided you know either the actual history or are familiar with the story of Abraham - considered the Father of both religions.
Sorry anti-Semites - these facts may tick you off.
Abraham's wife was barren, so Abraham had an illegitimate son (Ishmael) with an Arab hand maiden. Later, God reportedly intervened and allowed Abraham's barren wife to have a son (Isaac). Now there were two sons - Ishmael, an Arab, and Isaac, a Jew.
At one point Abraham is ordered to sacrifice Isaac - either by God, as a test of faith, or by Satan, to eliminate the righteous. But at the last moment by God's intervention an angel stopped him.
Years later, blind and on his death bed, Abraham called for his son, Isaac, to bestow upon him the entire wealth and land Abraham had accumulated, since Isaac was his only legitimate heir. But Ishmael came instead, and fooled his blind father into thinking he was Isaac. And Abraham mistakenly bestowed the inheritance upon Ishmael.
Ishmael, the Arab son, had stolen Isaac's inheritance.
Ishmael went on to lead the Arab tribes (from which Muhammad was descended), while Isaac went on to lead the Jewish tribes (from which Jesus was descended).
To insure that he would keep that which he had stolen, Ishmael spent his life trying to destroy Isaac and the Jews.
Fast forward a few thousand years, the Disciples of Jesus write the Books of the Bible, and a few hundred years later Muhammad writes the Qu'ran, bringing the Arab tribes together to form a caliphate and to destroy all Jews and infidels. The violence against the Jews continued with a passion, as Arabs still feared losing that which they had stolen. The fighting between them has never stopped, and will not until one or the other - or both - are destroyed.
The Crusades began because the Arabs waged war against the Jews and were intent on taking Jerusalem and the Temple Mount. As Christians, King Richard and the Knights Templar waged war against the Arabs (and lost).
ALL the violence in the Middle East is instigated by the Arab Muslims, intent on destroying every vestige of the Jewish people, as they represent the true heirs of Abraham. In fact, the Qu'ran actually requires the destruction of the Jews. The Bible, on the other hand, does not call for the destruction of the Arab tribes.
What we have here is the eternal war between two sons, one Good, the other Evil. And when the "End Times" come, it will be brought about by these two factions in their final battle to destroy one another, and the entire world will be caught up in it.
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