From the Irish Times article posted above this to me as a Jew, is most pertinent:
'But for Jewish and Israeli ears his words were not only profoundly inappropriate in that he deliberately politicised the memory of the Holocaust in a way that poisoned the event for some in attendance, but that he seemed to some to draw equivalence between the industrialised murder of six million Jews and the horror of the last 15 months of war in Gaza following the Hamas terror attack on Israel on October 7th, 2023.'
I would have turned my back on Higgins too.