Sorry ...nope ...don't get it.
You're not trying hard enough for what is a fairly simple concept. Manufacturing is struggling with the high Aussie dollar, which was brought about by the mining boom. Sooner or later the mining boom is expected to come to an end. When that end comes we will have to turn to other industries to drive the economy. Manufactoring might be one of them, especially in the high tech end. The car industry is the most high tech industry we've got. If we simply let it whither away and die during the mining boom it would be very difficult, almost impossible to revive it again once the boom is over. So for a small-ish investment spread when out over 10 years we keep the industry going. it's not just making cars, it's keeping and building skills in engineering, robotics, IT and all the other associated stuff. It needs a critical mass to keep all of this skill base alive. Makes sense to me.