If you don't want to be able to open files from Windchill directly in Creo View then you shouldn't need publishing. You probably have a property turned on that tells the system to automatically publish everything upon check in. You will probably want to turn that off. The property is called "publish.service.readytopublish.enabled". For more information, see the Windchill Visualization Services Guide.
http://www.ptc.com/WCMS/files/157363/en/WindchillVisualizationServicesGuide_10-2_M020.pdf