This would result in an unequal treatment of applications. A criminal act committed elsewhere has to have a Canadian equivalent to prevent any misuse or abuse. In the case of Fahmy, I think that would not be a criminal offence in Canada and therefore it would not apply to a situation such as his.
Moreover, I think there are safeguards. The minister has the ability to waive on compassionate grounds.
As long as you haven't had a criminal record for four years, I believe you can get citizenship. There are means to get around that for those who might have had their criminality considered under different circumstances. We have the safeguards and this isn't needed.