Your concern is with the executive powers, that's an issue for the judicial branch. Our discussion is about the legislative branch and the electoral process. That's how we create law. This discussion is about the consequences of nullification of law that we don't like that does not violate some inherent human right (and no, I think it's fairly absurd to suggest that overstaying a visa is some human right, and I also think it's even difficult to suggest that seeking asylum in one nation specifically, and not a neutral third-party nation is some human right).

You're talking about the specific day-to-day of enforcement, which I've repeatedly said I don't like, and is probably a problem in many cases. That is important, it's also worth discussing, it's just very much NOT relevant to a discussion of the risks and consequences of states going down a path of nullification of a law that is popular on the federal level.