Australia is deporting New Zealanders for committing crimes, even if they have not seen New Zealand for decades.

This is not as bad as when the US deports people to countries where they don't even speak the language. But it is nonetheless unjustifiable.

The full enormity of Australia's policy can be seen in its attempt to deport an Australian citizen, with Australian roots, who happened to have New Zealand citizenship too. Cancelling people's citizenship is not a legitimate punishment.