I don't understand how "logistically" the "anchor baby" situation works with *no US citizen parents*.
How does that work, logistically?
Does the kid have to get a passport? Or does he just have his "citizenship" when his parents have to leave?

So we've got little U.S. citizens, who are promptly "deported" from the country by their parents? Capable of exerting no real U.S. citizenship until they grow up?

It seems (to me) at the minimum you have to require at least one parent with U.S. citizenship.