The rhetoric about SOPA and PIPA has always been centered around foreign piracy. The reasoning is very simple: domestic piracy can already be stopped through the DMCA. "Overseas piracy" is basically just defined as any piracy the DMCA can't stop, because it's not within the United States' legal jurisdiction to do so.
Unlike the DMCA, which seeks to stop domestic IP abuse, the point of SOPA and PIPA are to create barriers between foreign IP pirates and domestic consumers, by requiring domestic gateways (which are under US jurisdiction) to police and filter them out.
Unlike the DMCA, which seeks to stop domestic IP abuse, the point of SOPA and PIPA are to create barriers between foreign IP pirates and domestic consumers, by requiring domestic gateways (which are under US jurisdiction) to police and filter them out.