If you talk to almost any politician in Canberra at the moment, they will tell you there is something disturbing playing out in their communities. Many are deeply unsettled by it. Anger at a war, unfolding in real time on social media, is triggering animosity. MPs are detecting a level of polarisation — some call it intolerance — that they haven't observed at this level in their careers. Perhaps even their lives. After last year's polarising Voice referendum vote, Australia went almost immediately into a period of domestic conflict over the war in the Middle East. The tensions have been...