I think before we can address the revisionist views concerning any kind of RIGHT of return, its important to establish who is ELIGIBLE to return in the event an agreement is ever reached between the parties involved.
From
Legal Aspects of the Palestinian Refugee Question, by Ruth ...
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Who is a Refugee?
The question arises whether all those registered with UNRWA should be considered as refugees. The 1951-1967 Convention Relating to the Status of Refugees4 has adopted the following definition:
...[A]ny person who: (2) owing to well-founded fear of being persecuted for reasons of race, religion, nationality, membership of a particular social group or political opinion, is outside the country of his nationality and is unable or, owing to such fear, is unwilling to avail himself of the protection of that country; or who, not having a nationality and being outside the country of his former habitual residence, is unable or, owing to such fear, is unwilling to return to it...
There is no mention in this definition of descendents. Moreover, the convention ceases to apply to a person who, inter alia, "has acquired a new nationality, and enjoys the protection of the country of his new nationality."5
Under this definition, the number of Palestinians qualifying for refugee status would be well below half a million. However, the Arab states managed to exclude the Palestinians from that definition, by introducing the following provision into the 1951-1967 Refugees Convention:
This Convention shall not apply to persons who are at present receiving from organs or agencies of the United Nations other than the United Nations High Commissioner for Refugees protection and assistance...6
In no official document have the Palestinian refugees been defined, and UNRWA has been adopting varying definitions, such as:
A Palestinian refugee is a person whose normal residence was Palestine for a minimum of two years preceding the conflict in 1948, and who, as a result of this conflict, lost both his home and his means of livelihood and took refuge in one of the countries where UNRWA provides relief. Refugees within this definition and the direct descendants of such refugees are eligible for Agency assistance if they are: registered with UNRWA; living in the area of UNRWA operations; and in need.7
This is a very broad definition under which the number of refugees constantly increases. It may be appropriate for UNRWA purposes in order to decide who qualifies for assistance, but it is hardly suitable for other purposes. It follows that the parties should agree on a more suitable definition.
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So not only does the UN not provide a viable and legal definition of who a palestinian refugee is but we still have the issue of combatants and their descendants within the present group the UN assists in the middle east and tend to get lumped under the heading of refugees but in fact are not. Which is illegal given that there are laws of neutrality the UN is supposed to be adhering to but can't be if its lending aid to combatants. Food medicine, shelter, providing staging areas, return of missiles military education all are considered aid.