When a gunman murdered 35 people in Tasmania in 1996, Australia’s political leaders united to implement some of the West’s toughest gun laws. Nearly three decades later, after 15 people were killed at a Jewish festival at Bondi Beach, consensus is more elusive. Prime Minister Anthony Albanese’s call for tighter gun controls is meeting resistance from ascendant right-wing populists and some mainstream conservatives, revealing a more polarised landscape that contrasts with Australia’s response to...