Protecting copyrights is one of the few things the federal government should be doing:
Article 8:
To promote the Progress of Science and useful Arts, by securing for limited Times to Authors and Inventors the exclusive Right to their respective Writings and Discoveries;
Stipulated. The question becomes how should it be doing it. This is a criminal investigation, resulting in an arrest and presumably a criminal prosecution. Then what? We're going to incarcerate "web bandits" when we literally don't have room for child molesters and rapists?
Just because something is illegal, doesn't mean it's criminal. In fact, a great deal of the US Code prescribes civil penalties - like fines and property forfeitures - and not criminal penalties.
I don't think that given our precarious security situation, mass illegal immigration and completely unsecured borders, our DHS and ICE departments need to be sending armed agents to arrest a guy who linked to something he may or may not should have.