Why did Zionists feel entitled to land that wasn't theirs?

they are entitled to the land... it was given to them by the UN. they are entitled to the land because it was given to them by god and the UN years ago. they have the right to defend themselves against any attacks by terrorist morons and corrupt governments that that have the sole aim of destroying Israel and jews. in 1948 5 arabs countries attacked a country that had just been born. it was "born" lawfully and authorized by the UN. it belongs to them, no one can take it away, not even Moronic muslim extremists that .