According to this poll, Sinn Féin has a higher number of supporters than any major party who think Ireland is taking too many asylum seekers (top is the rather inconsequential party Aontu and second is independents.)

As I said in the last video I posted, people underestimate how many of Sinn Féin's supporters support them because they still see them as a nationalist alternative. As long as these protests continue it is causing huge damage to their attempt to coast off old populist sentiment and they will bleed a lot of supporters to real populist alternatives.