First of all the Jews are the oldest surviving inhabitants of the city. It was founded by Shem and Aber - ancestors of Abraham. Secondly all entire human history is a history of conquests. The winner in most of the cases doesn't give anything back. Only the Jews are required to do so for unknown reasons. Just ask Russians about Kaliningrad or Kuril Islands. Or the Poles about Silesia. Or French about Lotaringia. This is true especially if it has been acquired as result of the war, where agressor lost the territories.
Islamic State destroys part of Syria's Temple of Bel, monitoring group says (Reuters)
from the article: Lieberman: Jerusalem is our eternal capital, it will never be divided