It's interesting just how 'neutral' Ireland were during WW2 - allowing allied airmen to return home whilst interning Germans, allowing overflights of Allied aircraft (Donegal Corridor), passing over a 'captured' Ju88 with the latest radar to the RAF, weather reports and forecasts passed to the British, repairing of Allied ships in Irish shipyards amongst other things.. The Irish security services also effectively put an end to the IRA during the Emergency..
De Valera was a pragmatist - he recognised that if Britain were to be defeated, Ireland's own position would be considerably threatened. he also recognised that a hostile Ireland may see the threat come from the UK .