Perhaps it is a hangover from John Knox, or perhaps it is the mountainous terrain inviting Scots to scale the heights, but what is certain is that, since the dawn of devolution, Scottish politics has become a fierce struggle to occupy the moral high ground. The SNP has long cloaked itself in supposed moral righteousness, but under Nicola Sturgeon sanctimony has become the defining characteristic of nationalism. Ian Blackford, the SNP leader at Westminster, can make a question about traffic cones sound as if he were denouncing Robert Burns to the Kirk session for serial fornication.