The suggestion that Ireland carries shame for the Holocaust is as daft as blaming the nation for the Cambodian genocide of Pol Pot. The British and the allies did not go to war to bring an end to the Holocaust. The "Endlosung der Judenfrage" or Final Solution was only initiated in 1942 long after the war started. The great powers stood idle and none were 'sabre rattling' over the persecution of Jews all through the 1930s in Germany.
When war was declared it was not declared for the protection of the Jews, nor did the plight of the Jews even merit consideration in any allied military strategy.
Ireland could not take refugees because of the severe economic damage inflicted on the country by the Anglo Irish trade war that only ended in 1938, but from which recovery took decades. There were no jobs in Ireland, only abject poverty.