It's called escalated commitment. I'd like to think the govt will change its view, but they would lose face doing so.
Speed is only a part of what kills people (but still a significant factor). Driver training, awareness, surrounding factors (drugs/alcohol/fatigue) all come into the mix too. The driver training in Germany for example sees much higher highway speeds with much less road deaths- even when adjusted for population.
Driving to Melrose this past week, the speed zones are 110km/h most of the way. This could safely (IMO) be 120 perhaps 130- which would have equated to up to 2 hours off my 13hr trip. But you need to have the training to know when to slow down (as an example, on the roads east of Balranald NSW, where the roos are in mobs of 20 on the side of the road).
I still think it's a joke that 'Bazza and Shazza' (our hypothetical bogan parents) can have a terrible driving record, and still be entrusted to teach their child to drive, AND set them loose on our roads with an unroadworthy vehicle (after doctoring more than 50% of their learner driver logbook).
While we test for BAC, drugs and speed, we can't test for stupid, we can't test for fatigue, and we are falling short on proper, structured, driver training for new drivers.

