When society evolves, so too must its institutions, argues Per Capita\u27s David Hetherington in The Australian THE POLITICIAN burning the midnight oil on a weighty intellectual treatise has become something of a trend. Kevin Rudd has produced two lengthy essays this year. Malcolm Turnbull recently responded, bravely claiming that his relative brevity might engender wit. The latest is Opposition frontbencher Tony Abbott, whose book Battlelines is described on its cover as "the essential manifesto for the thinking liberal".Abbott\u27s book is important for three reasons. First, it\u27s important politicians engage with ideas. Politics driven by opinion polls and focus groups serves us poorly. Second, a critique of established wisdom is essen...