646,
1. Apparently the Hamas is not as fearful as the Iranians (who do not yet have missiles that can reach Israel from their country) and Syrians. Moreover, the fact that the IDF and Shabak have freedom of action in Judea-Samaria prevents many terror attacks.
2. According to international law a country may annex land taken in a defensive war. In any case, J-S (as well as Jordan) was set aside by the San Remo agreement as part of the Jewish state. There are also precedents for expelling hostile populations (e.g. the Greek-Turkish population transfer of 1923 of the expulsion of the Volksdeutsche from several European countries after WW2)
3. J-S is ours according to Hashem’s law.
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