If there are problems with the way legitimate business is being done either in the United States or trans-nationally, the transactions are subject to national and international law and suspect dealings can be brought to appropriate courts of law for an accounting.
If you don’t think officials in the United States are accountable for misconduct in business dealings, just ask Senator Feinstein about how her steering of defense MILCON contracts to firms owned by her husband is working out these days. The importation of ethanol will be subject to a full range of environmental, commerce and energy regulations and reviews before any Bush brother makes money off of supposedly suspect dealings with Brazil.
This article reveals (along with the pet food scandal, and the children being killed while being forced to make fireworks in their school scandal, and the CD and software pirating scandals, and the building collapse scandals, and the mistreatment of foreign teachers of English scandal, and the exploitation of factory workers and small holding farmers scandals, and the collapse of rural health and education funding scandal, and the alleged nearly irreversible pollution of the Yellow River scandal, and the ... shall I continue(?)), that, as a group, Chinese businesses ARE corrupt, and the Chinese government IS fully involved in aiding and abetting the process. Everything, EVERYTHING is presently being sacrificed to that favorite Chinese past time, making money. (And, unfortunately, with the exception of a few lonely voices crying in the wilderness, the United States and the remainder of the world is apparently perfectly willing to allow this relentless exploitation of a talented and industrious people for purely pecuniary reasons. It is really quite disgusting.)
Occasional crackdowns not withstanding, the Chinese court and legal system functions as a tool for the party to suppress any form of dissent that might threaten party domination of the people and acts as an aid for corrupt party officials to use in furthering their and their business partners' schemes. Of course, the police and courts do also perform regular law enforcement functions. They do them because not to do them is to permit a threat to the orderly society any government needs to maintain control of its population.
In short, without severe performance guarantees, few Chinese businesses can be trusted at present to observe their own or international law in an honest and conscientious manner. Without close and constant observation, the reliability of the Chinese government to be a faithful and impartial enforcer of the same is not certain.
I’m sorry if this criticism challenges your perceptions about China but there is just no comparison between the two governments and countries. In fact, the Chinese people would be much, much better off if they were just subject to levels of corruption presently endemic in the United States' governments and businesses. That's how big the difference is.