The rights and wrongs of the extradition system are a different arguement, the fact is it exists in a currently agreed form, and it allows a claim to be made in the USA by a damaged party. In this case, most of the copyrights are vested in American organisations, so fair enough.
There are plenty of considerations about the laws and legal systems we are exposed to, this is one of them. But once a defendant has explored all the appeal routes available to them, and they have perhaps failed, then you end up simply questioning the appeal court judges' decisions. I imagine they get things right 99% of the time.