Yeah, I (well, she) had this experience entering the US with a non-American girlfriend, 10+ years ago. She was pulled aside, grilled, treated terribly, and emerged in tears 30+ minutes later. It really made me angry, because it's not as effective _security_-wise as what we were used to flying the other way. Immigration agents at Heathrow were generally so polite and accommodating (eg, let me go through the EU citizens path, when we were traveling together), that I typically revealed more about my travel plans than I probably _had_ to, and / or may have been wise. It's dumb and self-defeating, and should be a source of shame for all USA-ians.
yeah, it's not even a job well done the way it's done. usually more power tripping above all else. the security theatrics of TSA should be gutted to be honest. I remember flying into the US in the 80s, that was a treat. Very different times.