As a Muslim it is very simple to argue theologically against the Islamists. Islam is nothing if not justice. Any injustice committed or pursued in the name of Islam is anathema to the believing Muslim and counter to the ideal which is Islam.
Irshad Manji claims that not just Muslims, but the Quran and Islam itself need reformation. In doing so, Manji ignores the possibility that the owner's manual might be fine, while the issues lie with the owner.