You first have to lose an election on principle if you want to win one on principle.
This was how Labor rationalised the miscalculations that led to its “Don’s Party” disappointment in 1969, followed by the 1972 triumph of the “It’s Time” campaign.
Half a century later, the idea of sticking with unpopular policy seems romantic, unthinkable. Principles are not just old-hat in an era of professionalised politics, but absurd.