They shouldn't have attacked Israel then.Land that isn't theirs is anything outside the 1948 borders.
You're right, they shouldn't have. It still does not give Israel the right to annex conquered territory.
See anti Semitism because you are repeating a LIE about Israel without first researching if it is correct. When did Israel annexe conquered territory, give dates and place names of actual annexed territory. make sure that the territory is not owned by Jews who have title deeds to the property or not signed over to Israel by the Palestinian leadership.