Deporting people and not admitting them are not the same thing, you get that right?
No, You don't.
This doesn't actually matter - Your libertarian ideology fails because even a minority of people not adhering to your ideology will always be able to form a group and subvert your will.
In fact, we know that this is what happened,
literally, everywhere in the world.
And the absence of this group,
produces abject misery.
Migration is neither a freedom or a right.
A state owns its land, and can therefore, using its property rights, restrict entry to whomever the fuck it likes.