Why should state officials ever be allowed to interrogate U.S. citizens' political opinions, regardless of whether those citizens happen to be standing in an airport?
It makes perfect sense that Customs be allowed to inspect physical items passengers bring through the airport, but what rationale says they should look through your computer files, especially in a post-Internet world? (I.e., there's no sense in claiming that you'll stop child pornography or other hot-topic illegal data entering the U.S. in an age where the Internet exists.)
