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How do you kill a set of ideas that affect social cohesion when the online environment creates an infinite number of opportunities for people irrespective of age to access extremist material and become radicalised?

This dilemma is at the core of what the federal parliamentary committee delving into extremism and radicalism is grappling with as it tries to understand what makes individuals follow ideologies that can lead them down a destructive pathway.

An illustration of this is the frequency with which people giving evidence to the committee refer to the availability of the manifesto of the Christchurch shooter and how the manifesto, which was first circulated in March 2019, has inspired further violence from individuals who have been radicalised online.