Often times the problem is that you denaturalize them, but then you can’t get their home country (or any others) to actually take them off your hands.
We should play hardball, they wont accept their criminal nationals? we won’t accept their goods or travel from their country. Of course the global elites would never allow such a thing, so we accept the trash of the world and then we make a fuss about it, but ultimately nothing changes.
Maybe a one-way ticket home would solve that?