Sir: While the intemperate and self-justifying attack by Clive Palmer on a business partner (China’s Citic Pacific) deserves complete rejection, his and Senator Lambie’s outbursts (a “Chinese invasion” and “enslavement of our grandchildren”) do contain a kernel of justifiable concern and warning for all Australians. First, we need to be aware of the accelerating dependence of our economy, evident in a rapid increase in reliance on Chinese purchase of minerals; also, capital investment (that is, ownership and control) of Australian real estate, mineral resources, agricultural land, and more, all overseen by an ineffectual Foreign Investment Review Board and a government…