It's the individuals at the end of the day.. not companies, not the government, but each and every one of us.
The ones that don't care whether they're buying a cheap korean built car, or one built in Australia to keep jobs in Australia - simply as one of them is a lot cheaper for the same specs on paper. Only way the Aussie manaufacturers to compete is to start using more and more overseas parts. If people were prepared to pay more for quality, things would be different, but people simply don't care about this side of the buying equation anymore.
It's all the lowest price, which leads to lower quality products, and eventually even the higher quality manufacturers have to start shaving their costs, leading to even lower quality high-end products.