The election of Abraham Lincoln triggered the beginning of the U.S. Civil War. A contributing reason was because Lincoln would not allow slavery to expand. The supporters of slavery knew their days were numbered. If slavery were not allowed to expand, the support of slavery would become weaker and weaker as time passed.
Today, a key demand in the Israeli – Palestinian problem is Israeli settlements. No new settlements are demanded by Palestinian politicians. It could be that they want Israel to stop expanding so that their days will then be numbered. Another potential influencing factor: The occupation of Muslim land triggers a worldwide obligation to kill occupiers. The penalty for leaving Islam is death. Not only can you not convert to another religion; Muslim land cannot revert back to being non-Muslim. These factors can be seen as not only basic contributing causes for the constant Arab-Israeli wars, but an important factor in the violent response to Israeli expansion.