A digital virus spread by terrorists left bodies on the streets and cities quarantined by the government...For a week, the efforts of malicious players left behind massive casualties, made cities nearly uninhabitable...

-SecurityFocus

Luckly this was just in a game - but this poses an intresting thought. In game, terrorists took a plague and spread it all over. I don't know if the terrorists had any agenda besides death and destruction, but what if they had? Could you threaten a MMOG publisher with acts of in game terror to get some change made? Could they hold you responsible for acts of in game terror?