Unionist politicians, I sometimes think, compete with each as to how they can make the rest of us gape, open-mouthed in wonder. You’ll remember Peter Robinson and trusting a Muslim to go to the corner shop for milk. Or the unionist councillor who wanted to burn Catholics and their priests in a furnace. Or Arlene Foster’s refusal to step aside even as her RHI scheme burnt through another hundred million pounds. Gob-smackers all.