Its been left to private sector and 'negative gearing' tax breaks for investor-owners fuel the insanity. Now, with so many private owners vested, they are unwilling to risk voter backlash to undo the madness of 25+ years of bad planning.
In Queensland, they had a really stupid relationship with cooperative housing movements, co-owning properties in the inner city. Then they realized the huge value proposition in the land, booted the tenants out to cheaper outer suburbs and realized the capital gain. It sucks. Gutting suburbs like west end in Brisbane where I live did nobody any favours. Why shouldn't working class people live in the inner city too? They always used to!
(I'm an owner occupier. I just think rental madness in Australia is sucking life force out of younger people)
Everybody loves to hate on socialised housing but the alternatives are far far worse.