I'm surprised nothing in your house comes from China. You must very selectively choose everything in your house from basins to lightbulbs.
And yes, as people have said, free market does not mean no health standards. Not sure how you get the two mixed up.
The two are related. As I said, Australian producers work to high standards in terms of OH&S, paying super and minimum wages, environment and health; some other countries do not. Allow an open slather environment, and it's a fight to get to the bottom. If China is subsiding their farmers to the tune of nearly $2 billion and they are poorly regulated in terms of health, safety etc, their products would flood our markets as our Aussie farmers just cannot compete, and we would be none the wiser as to how that food was grown.
Health and safety becomes part of the equation when we allow the produce from countries who do not have our standards. We can have all the checks and balances that we like, but we do not know how the food was grown, in which conditions it was grown, and what chemicals were used on it.
We do currently have checks and balances in place to check all foods imported into Australia, but if only a small sample of each load is tested, you can't possibly be sure of the results, and that's why we get seafood with cholera coming into Australia. We can have as many safety regulations as we like, once we allow open markets we really don't know how that food has been produced.
Australian farmers do not use night soil as a fertiliser for their produce, but farmers in some other countries do. (That is why I buy only Australian produce) How do we identify that when it gets to our borders? We don't.
There are consequences to an open slather, deregulated, free trade environment, and one of those is safety and health.