Explaining Ireland's Extreme Anti-Zionism with David Collier

Ireland has a deserved reputation as the European Union’s member most hostile to Israel. For example, a report of social media accounts concludes that "anti-Jewish racism in Ireland spreads within the corridors of power and, unlike in the UK or US, appears to be as much driven from the top down as the reverse." Why is this the case? Is Ireland an outlier or the start of a trend?