If you had reason to suspect an unfriendly reception, then you should have avoided the USA entirely.
The use case is discouraging low-effort/low-priority digging for information. Asking to see your feeds costs them zero. Digging in deeper or detaining you would consume actual time & effort.
The default case, as I see it, is that you're refused entry and it's up to you and your airline to get you back home. Takes almost no effort on their part.
If you had reason to suspect an unfriendly reception, then you should have avoided the USA entirely.
The use case is discouraging low-effort/low-priority digging for information. Asking to see your feeds costs them zero. Digging in deeper or detaining you would consume actual time & effort.