- the seller received fair market value in the 30s (to be fair, sometimes this value was lower than it might have been in the best possible market due to the speed at which the sale had to be made);
- the families then often received compensation for their various losses (unless the Israeli government, or the Jewish lawyers running the compensation scams, got their hands on it first!); and
- they get the art back from the completely innocent public institution.
It should not surprise you in the least that these cases only work one way, if the 'victim' is Jewish. A public institution trying to use the same case law to recover art in the hands of a Jew is out of luck.