In a nutshell. In the case of MGM vs Grokster, the supreme court ruled The person responsible for distributing the means to infringe said copyright material, with the intent to further perpetrate the copyright infringement is liable for the resulting acts of copyright by the people downloading the material.
In layman terms. The guys who give out the software are the people legally accountable for any copyright infringement.
So when a big company like Time Warner sue's some single mom for $200,000 and bankrupts her. The people that should actually be getting sued are the distributors of the software.
This guy has proof that the same company that is accountable for distributing the software is also suing the people that use it. He further details how these companies coached users in methods on how to easily download the copyrighted material.
The whole premise for this was to introduce a "copyright violation culture" so they can easily implement crazy, radical laws that allow huge companies to basically control the internet.