On Saturday, Australia's former deputy prime minister Tim Fischer blamed the gun culture in the United States for the shooting and condemned America's lax firearm controls as a corruptive influence around the world.
Peter Lane refused to be drawn on the subject.
"I've said at the start we're not buying into gun control, punishment, race issues. Our kid died in horrible circumstances and that's not going to be solved by me sitting here making statements about the American political system or anything like that," he said. "He met fantastic people in Duncan who as far as I'm concerned are representative of people in the U.S."