What pisses me off is people sweeping this under the carpet and saying "this isn't us." particularly the Australian media as this is contradicted by a number of Australian senators who were elected. You don't solve problems without confronting them.
It is us and it is Australians. Anytime we do anything to dehumanise others, even if it's a joke or talking about stereotypes, we're complicit in the thinking which made this terrorist.
We're herding animals, we stick to our herd and we talk think less of others. Our herds have grown from families, to villages, to towns, to cities, to religions. The challenge for us is to utilise the technology that we have to grow our tribe to the world.
We stop this by stopping stereotypes. By stopping casual racism. By thinking of others as humans, not by looking down on others.
I heard on the radio that the debate about video games has restarted - that they are the cause, to me video games are the easy targets but they don't stop the fundamental issues in society. They are the symptom not the cause.
We don't stop this by ignoring it, calling it a one off, and not using the opportunity to fix our society. Because terrorism comes from disillusionment and alienation as much as by stereotyping and dehumanising. The only way to fix this is simply to treat each other with respect and be nice to each other. That's it. As easy as that. The way not to fix this is to say "this isn't us." and move on.