ollieg writes:  
"The motion was already being debated by Canadians prior to those shootings. If anything, the backlash against 103 would have been even worse if not for that attack."

Not true.

Although M-103 was tabled in the fall, it was barely noticed until just before its first day of debate in the House in mid-February - and then the nativist outrage began.  

The delightful rebel media ran its first bit on it on February 8: "a motion called M-103 is coming before Parliament on February 16 to urge special consideration regarding “Islamophobia” without defining the word" wrote Barbara Kay.