It's interesting that his mother has positioned herself in a role that makes decisions about who will be a new Canadian.
Did the murderer suddenly, out of the blue, have crazy ideas about killing people if they did not adhere to his set of beliefs (per ISIL), or was he predisposed, perhaps during his upbringing, to have strong feeling about others that have different beliefs?
I think that the shooting at the memorial was supposed to serve as a distraction - to pull security away from Parliament Hill, and make it easier for him to enter the building with a gun