The hardliners and headbangers to whom you refer are a small group of extremists who will grab at any straw they feel may suit their cause. I have no idea about Jeffrey Donaldson’s reasoning for leading his party back into Stormont but my guess would be that he, and the number crunchers within the DUP, saw the boycott was a greater threat in the upcoming election than going back in. However that is speculation, what is known is that he secured the majority of his party’s support for going back in, having the government functioning again is the wish of the majority of the DUP and of the majority of people in Northern Ireland. Ben Habib, Jim Alister, Kate Hoey et al can have their say at the next General Election, let them put their argument in front of the Northern Ireland electorate and let us see what support they can garner.