Jonathan Haidt’s latest work The Righteous Mind is a serious piece of heavy reading in every way. The hardback thumped into my briefcase at a sturdy 702 grams. And its 321 pages of erudite thinking is backed up by a further 51 pages of notes plus 17 pages of detailed index. Its sections and sub-headings are seriously crisp and the arguments are summarised and presented as ‘Exhibits’ – to give the book the kind of gravitas that would suit a judge’s chambers. And to be fair, the subject matter and the quality of the work suits it.