In the quiet hours before a flight to the Middle East, a 30-year-old man from Melbourne's Roxburgh Park was intercepted at the airport — not for what he carried in his luggage, but for what he carried in his devices. Australian federal authorities allege he was woven into an online network deliberately circulating ISIS propaganda and graphic violence, part of a pattern that has now seen six Victorians charged in recent months. The arrest raises the enduring question of how societies draw the line between the open flow of information and the organised spread of content designed to dehumanise an