Could it happen here? That is a question to haunt this country whatever the outcome of the hostage crisis in Sydney yesterday. Some will say it is less likely to happen here because unlike Australia, New Zealand is not taking part in the air strikes containing the advance of the would-be Islamic State in Iraq and Syria. But if this jihadist band has appeal on the internet to all sorts of angry and alienated attention seekers, there is no reason it could not happen here.
At least one armed man appeared to be inside the Lindt cafe holding customers and staff hostage. It might have been one of a number of co-ordinated attacks - the Opera House was cleared after a suspicious device was noticed there - but one or two gunmen in a cafe can make all the impact they desire.
Speaking on television, Prime Minister Tony Abbott said the purpose of these things is to scare people, but it is more than that. In the twisted minds of so-called "terrorists" they are seeking attention for their cause. They terrify those they use to attract attention; their captives in the cafe were seen shaking and sobbing as some of them were forced to hold a jihadist banner at the window. But the rest of the community is not terrorised. It is simply disgusted in the same way as it is by any threat to kill.
Political violence differs from ordinary crime only in its attention seeking. It would not have been by chance that its target yesterday was a cafe in the central business district directly opposite the offices of one of Australia's main television news networks, Channel 7.