Besides not accepting Israel offer to take in the Arabs who went away during the 1948 war or compensate them for their property, the Arab states unanimously voted against resolution 194. It is, therefore, hypocresy for those same Arabs and "Palestinian" representatives to see the right to return in that resolution, which they failed to recognize. Besides 194 requires that Arabs live at peace with their neighbors, whch means that they have to recognize Israel's right to exist.
U.S. confirms ISIS computer expert killed in air strike (Reuters)
from the article: Of course, Egypt is to blame