I have learned very little about this because it's extremely obvious we are learning a politically spun version of the story to drum up a hysteria. Not interested in being involved in that.
It is also completely true and well-known that in Canada you do not have unlimited rights to take a life as soon as someone crosses an imaginary border, as you might in the States. I think that's fine, and the fantasy of "defending yourself" is an American invention of hyperindividualism. The very same that has been absolutely ripping apart their society at the seams. Not really interested in following in their footsteps there.