Their "peacekeeping" missions are somewhere between utterly impotent / useless and actively counterproductive. Playing dumb and doing nothing while Hezbollah uses you as cover to launch missiles over the border from a couple hundred meters away is not keeping the peace.
That assumes that their mission is to stop anything. UNRWA's sole mission (like most large-scale nonprofits - not suggesting they're unique) is to continue to procure money for its 30,000 or so salaried posts.
Additionally, it assumes that the Irish, who broadly as a people support national liberation movements, would even want to prevent Hezbollah from rebuilding, even if they could.
