said by rradina:
...not engage in such activities and to hope the data we provide is accurate."
Even if people don't engage in such activities, and the ISP data is accurate, it doesn't mean that they won't be sued anyways.
That's what part of the issue is. There are too many hops in the evidence to get from the movie studio's evidence to the person accused. Was the ISPs information accurate? Was the studios? Who's computer had access to the access point? Was it public or compromised? Some of the information there may be no way to conclusively prove that they are accurate or inaccurate.