the issue I see with revoking someone's citizenship ship is in the following hypothetical
Roger Kaputnick is a dual national of Australia and the UK (or pick any country).
The minister for immigration (in Australia) revokes his citizenship for something.
The UK (or whatever country) he also has citizenship of hears about his revocation/deportation, drafts legislation (or already has), and also revokes his citizenship before he arrives back.
or the UK (or whatever country) gets wind of the possibility of the revocation, and strips his citizenship first.
