The same reason underlying reason why the US has the largest gap. Austalia is not a threat to anyone, The US is a dominant power hence it is the candidate for any psyop attack.
Australia is fundamentally in the US-led Anglosphere, and debates that originate in the US eventually flow to Canada, Australia, NZ, the UK, and to a lesser degree much of the US-aligned world (e.g. SK, Japan, Israel).
Kids should be learning about these things at school, they need to recognize attempts at polarizing, creating conflict, and make them perceive other members of their own society as enemies. Both young and older people are vulnerable as these "trolls" (which is not an appropriate name any longer btw) use some real social problems as a starting point and escalate them. And they're extremely successful in part because of social media apps algorithms that effectively act as amplifiers of extreme content.