The British government is responsible for the renewed turmoil in Ireland
The fundamental reason for the turmoil in the north of Ireland and in the main party of Unionism is the outcome of Brexit and the NI Protocol which was part of it. These change the relationship with Britain – the north of Ireland is effectively in the same customs and trade bloc with the Republic of Ireland and the rest of the EU, while there is now a customs border between Britain and Ireland as a whole.