Just follow the money. Don't even need to do that, its very obvious which industry group benefits from attacking the Greens. It is the same companies, majority foreign owned who aren't paying their fair share of taxes.
It is hard to understand how anyone would fall for these corporate propaganda campaigns but then you think about the number of phone and internet scams and see all the fraud and weird cults around and I guess you just have to influence enough people to shift the goal posts. They must be spending a fortune per vote. Must be nice to have a licence to steal our countries wealth and not give anything back.