You would be greatly mistaken if you thought the Irish's sympathy for Palestinians was because of anti-semitism. Ireland was once a great supporter of Israel, but right or wrong they now see Isreal as a "little Ulster". Here is some reading:
I recommend reading the full piece: http://www.foreignpolicy.com/article...alestine?page=As citizens of a small, neutral country on the margins of Europe, the Irish public's primary interest in foreign affairs relates to international law, human rights, anti-imperialism, and a proud history of engagement with the United Nations. This worldview, combined with a healthy appetite for the freedom-fighter slogans and anti-colonial language that left previous generations weak at the knees, explains the ongoing attachment to the Palestinian "underdogs."