This rule only makes sense if we have a way to revoke the citizenship of Canadians with no other citizenship.
What if two people got together to commit an act of terrorism, one of them held dual citizenship and the other was only Canadian. They are both caught and convicted of the same thing and go to jail for 20 years. When they are released we welcome the Canadian back into society assume that he is rehabilitated and move on. The dual citizen serves his prison term and is then escorted out of the country and asked never to return?
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