Ireland has a history of antisemitism.
From instructing their embassy in Berlin not to issue visa's to jews to facilitating the escape of Nazi war criminals
https://www-dailymail-co-uk.cdn.ampproject.org/v/s/www.dailymail.co.uk/news/article-2092138/amp/Irish-minister-admits-time-Jews-fleeing-Nazis-denied-visas-1930s-morally-bankrupt-regime.html?amp_js_v=a6&_gsa=1&usqp=mq331AQHKAFQArABIA==#aoh=16225619126352&csi=1&referrer=https://www.google.com&_tf=From %1$s&share=https://www.dailymail.co.uk/news/article-2092138/Irish-minister-admits-time-Jews-fleeing-Nazis-denied-visas-1930s-morally-bankrupt-regime.html
De Valera was an evil treachorous devil long before WW2. Ask Michael Collins.