Australia is a special case as it does not have a national-level bill of rights [1]. There are various cases that enshrine aspects of human rights as Australia is party to many UN human rights agreements, but there is no central easy document people can go back to like the US constitution or the German Grundgesetz. That allows for easy overreach that has to, time and time again, be pushed back by courts and then enshrined in new laws. For example, age discrimination is unconstitutional in some countries but is only illegal in Australia since the Age Discrimination Act 2004. So Australia needs piecemeal laws for every civil rights issue.
[1] https://peo.gov.au/understand-our-parliament/how-parliament-...