Please read the book Six Days of War by Michael B. Oren, apparently you're missing the details of what you deem as 'conquered' land. The countries of Jordan, Egypt, Syria, with aid from Russia, Iraq, Morrocco, and all surrounding Arab states were intent on wiping Israel off the map, and taking Tel Aviv. Israel happened to win this war against all odds, with merely 2 million citizens at the time versus massively equipped large nations like Egypt. This is why the area has been 'conquered' and it remains in Israeli hands as it should, because it no longer belongs to Jordan. Jordan lost it, for wishing Israel's destruction at the time. Currently we're dealing with a territory that is strategically not to be trusted in the hands of the Palestinian Authority, or any other of the surrounded Arab nations that wish Israel's demise. It is Israeli territory and a buffer zone, without which Israel will be attacked again. The take away here is: If you attack a country to wipe it out, and you lose = you have no sovereignty over areas you lost. And that's the fair game. Jordan accepted this truth and made peace with Israel. The palestinians who live there, as are the settlers, are under the control of Israel until further notice. Please read your history before coming out with propaganda words without demonstrating that you conceptualize the entire set of events.
Islamic State militants blow up ancient Arch of Triumph in Palmyra (Reuters)
from the article: Abbas urges U.S. to step into settlement dispute