Border Patrol Agents asking "Are you a citizen" should be an unconstitutional question.

"Here, admit to your guilt" a blatant violation of the 5th.

However, as you have said, a citizen gives up their rights for privileges, and so the question becomes legalese and appropriate.

One of the most interesting rights violations happens from Fire Protection Karens.
These people assume they have the right to come onto your property because fire fighters have a right to come onto your property. But they don't. And are coming onto your property to cause mischief and harm.

Fire fighters have an assumption that most people would want the fire department to come onto their property and put out a fire. If you tell them they are trespassing, all they can do is watch your structure burn.

But most don't know this and instead will kick you off your property to "save" you.