I understand that point. But surely they could explain it as a temporary timely intervention; a tactical move, on behalf of the people of Ireland and Northern Ireland, to stop the contrived and destructive right wing plot that is Brexit? It could have massive repercussions as regards protecting the economies of both parts of Ireland (and incidentally that of Britain too) from unecessary damage. And by putting them in a snooker of all snookers, could drive the DUP mad, leaving them heavily embarrassed in front of their farming base of support in the border counties. The Shinners stop Brexit initiative would garner world-wide press, and in every interview Michelle would mention the strange Cambridge Analytica links to the DUP, and all about how no one knows where the nearly half a million greenbacks funnelled by the DUP into Brexit came from... I would call that a win, win, win.
I dont think sinn fein are that keen on the EU either tbh, they'll probably see Brexit as ultimately a useful tool to push for a united ireland. Its not our place to 'rescue' Britain from Brexit anyway. If they had competent politicians it needn't be the absolute shitfest its turning into. Norway, Switzerland and Iceland manage just fine outside. They just have clowns in charge.