As @MissScarletInTheBallroom you said to Dream,
Can't they visit some airports anywhere else in the world and see how they're supposed to work?
Never been anywhere else where they can't cope with something as basic as putting your bloody luggage on your connecting flight.
And perhaps they could tell their immigration officials that it is a complete waste of everyone's time interrogating someone about the purpose and length of their visit to the USA when they are only transiting through and not planning to leave the airport (which you can see from their ticket) but thanks to you and your dumbass questions they've now missed their connection and have to stay longer than planned.
"Why do you want to enter the States"
"I don't. I want to enter Guatemala/Fiji/Peru/Mexico but you're stoping me do that."
I swear TSA and immigration in the States have never actually got on a plane to another country themselves. And they cannot fathom a world where people don't want to sneak into the US and live there.
Please understand I would happily avoid the States forever and would never want to live there. Which is a shame, because as DD said, all the real people in the US are lovely. But they hire the arseholes (assholes I suppose) to work in the airports. Everyone else in LAX, from the lovely young man who gave me his seat on the bus, to the cleaner who rushed up to our gate, to the sweet older lady who explained the bus signs were all wrong and made sure we got the right one, all fab.
But TSA and immigration seem to want to keep you in the US when you are trying desperately to leave, all the while being annoyed that you want to come in at all. Very weird.