I know exactly what I am talking about. No, I don't think they're stupid enough to use the stated reasons, but if any of those reasons are the real one they are going to have an interesting time coming up with a legitimate reason not to. If its a bs excuse there is no legitimate reason, which means no evidence to support their stated reason for denying entry. Should be real interesting to see the border patrol try to explain a 'they looked suspicious your honor' or 'we suspected they were up to something your honor....oh what? you want some evidence to base that suspicion on? sorry don't have any of that' excuse.
But thats irrelevant to the other point - the border patrol cannot do anything it wants to and is not immune from US law. If they were, then yes they would be able to turn people away for being black, or a woman or a muslim or whatever else they wanted to. Notice they don't do that? Gee, I wonder why that is. Totally couldn't have anything to do with the fact they know they have to follow US law at all
and drop the 'and theres nothing you can do about it hur hur hur' horseshit. There very much is, its called get a lawyer, contact the media and start an international incident. What do you think lawsuits are for. You want to talk about 'absolute facts?' You can sue the shit out of the border patrol and any other US organization that violates your rights or does something illegal to you under US law. That is an absolute fact
By your logic some border patrol agent could hit you in the head with a brick, claim 'he was acting suspicious and I had to defend myself' and theres totally nothing you can do about it. Yeah. I'd like to see them claim that and see what happens