That can mean very different things depending on your definition of 'going after'. If they chose to engage someone in a civil suit and could prove realistic damages, then in principle I wouldn't have a problem with them attempting to protect their IP.

But using the force and authority of the United States government (Homeland Security involved in enforcing IP infringement? Really?) to extradite a foreign national on criminal charges? That is in no way proportional to any of their perceived damages, and it goes to show just how bluntly the government is used as a tool by those with money and influence.