The Irish were actually supportive of the founding of the State of Israel as there was a common bond as persecuted people. The Irish state did caution against the partition of Palestine due to the lived effect of the relatively recent partition of Ireland. It was only when the persecution of those that identified as Palestinian began, that Irish opinion swung against the actions of the State of Israel.
https://www.theirishstory.com/2013/01/23/a-long-and-oddly-in...