>On one occasion a computer in the United States was compromised but, following infection, an uninstaller was launched within hours, which may indicate this victim was infected unintentionally.
Its Symantec, they run AV on thousands of computers across the globe. All the events generated from these computers get sent to them. Removal/cleaning procedures would be one of those events, probably for this very reason (i.e creator gets sloppy, installs and then uninstalls on their own machine).