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That’s what happened when the Israeli government and the Knesset voted to remove the settlers from Gaza. When one side loses out in a democratic debate, and a law is passed, if some decide to oppose the government’s decision, they are breaking the law—and the government is morally and legally justified in using coercion to insure that they follow the law.
Settlers do not have the moral or legal right to permanently live in the West Bank or Gaza, which are viewed by the U.S. and the entire international community - and Israel's own Supreme Court - as occupied territory.