One of the problems with nationalism – of any stripe – is its uglier undercurrents. The Scottish National Party has made great strides presenting itself as civic and progressive, but it’s usually never too long before blood-and-soil arguments start to come through. So you’ll hear fairly sinister arguments about how the SNP’s opponents are not really Scottish (a point made about me quite often) or that their opponents are not just wrong but malign, even evil and detestable.