Holocaust Day is indeed officially intended to commemorate all the victims of the Nazi Holocaust, aand also of other genocides. But I wonder how many people actually realise that fact, or that there were other victime of the Nazi Holocaust?
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The continued refusal to accept that there is a Right of Return for Palestinians is institutionalised ethnic cleansing. The same would of course apply to any similar policy in Arab (or European) nations where exiled Jewish people might seek to return.