Rooted in our complex history with Britain. My grandmother used to have a pop off my uncle for "taking the queens shilling"
Joining Nato now seems further away than ever in my opinion as sinn Fein is now the largest political party here and they're vehemently anti Nato. That's despite erasing all rhetoric about that topic from their website recently. But that might be more of a topic for the Irish politics thread.
I think there was a strong element of 'my enimy's enimy is my friend' with Ireland's neutrality in WWII. But, for most Irish men who faught the Nazis, they reasoned that they were an even greater enemy. I doubt the insult of
taking the Queen's shilling was the main driving force most Irish men who enlisted.
I am not downplaying any of the appalling history of England in Ireland. I can even understand Ireland's neutrality. Although,
some of this is hindsight - the full extent of Nazi attrocities only becoming generally known after the war - I think Ireland's neutrality was indeed wrong.
I recall (as a yound child) asking my Irish granddad if he was in the war and being very puzzled when he explained that he wasn't because Ireland was neutral.