[nraynaud]

There is a big thing with US travel: ESTA, advanced passenger information, and the airline thing whose name I don't know (when you check in, they already ask nosy questions about your travel and your girlfriend). So they had a lot of opportunities to stop him before he got in the plane without putting up with the burden of a US visa. They chose to let him come knowing they would refuse him.

When you try to go to the US, you have to get in some kind of trap (there are those stupid questions which I guess are a framework to make you a liar to a federal agent if you get caught later), drop all your privacy (that was probably gone anyways with facebook and gmail), and they have ample means to close it on you without being an asshole.

[anigbrowl]

I haven't looked at the ESTA thing in a long time, but from what I remember it does ask explicitly whether you plan to work in the US etc. etc. If you tell a border inspector that you're planning to play at a music festival then naturally he's going to assume you mean ot engage in commercial activity. It is up to the individual to read up on the requirements and exercise some basic common sense (ie customs/immigration officials tend to be pedantic bureaucrats wherever you go, so be circumspect).

Sorry, but I think you're projecting your biases here with comments like 'they chose to let him come, knowing they would refuse him.' My reading is that he probably answered 'no' to all the ESTA questions and then confused the CBP agent by giving contradictory answers to his questions. I'm European myself so I'm not carrying a particular torch for US border agents here.