First of all you presume that these people actually owned homes and fields. The large percentage of them were renters and squatters and workers on other people's fields. This was clearly documented by the British, who in the mid 1930's offered plots of land to anyone who could show that they were displaced by Jewish immigration. Of the thousands who applied, 80% were deemed frauds. Of the remaining, only a small handful actually continued to process to obtain these new plots.
Second, the right to refuse re-entry was granted by the UN resolution, which I clearly identified for you in my post #88. Israel was under no obligation, per International Law, to allow those hostile to Israeli interests to return. But over the intervening years some 20% of the refugees were permitted to come back into Israel where they now reside, as I stated earlier.