It's not a matter of rationality and logic. The executive believes the 14th amendment only applies to former slaves. They don't believe it's operable in the 21st century and they don't believe it applies to foreign nationals. They call such children "anchor babies". Courts don't agree with that, but the executive also believes courts don't have the right to limit the executive when it comes to matters of immigration.

I can understand why this level of pedantry is annoying but we are not dealing with good faith arguments here. They are power plays.