> What about all the other American companies doing business in China? Do they get to keep doing business because they are politically popular companies but Google is not? Or would this be a government mandate of a broad based American pull out?

Getting the US government involved period is a bad idea. Government interference in business is how big government starts. You need more and more agencies to police business behavior, and that eventually leads to large, inefficient, and inept bureaucratic agencies that do more harm than good. Example: EPA, FDA, etc