I was affected by this as well. I live about 30 minutes outside of Toronto and know that area very well. It seems to shake people up more if they are closer geographically.
As the the why questions. Even if we knew the why of his reasons, it would still be a big question mark because it wouldn't make sense to those of us in this world who are not murderers.
Some people take delight in controlling others - even whether they live or die. I can't relate to that mindset.
I am grieving for those injured and for the families who lost loved ones and those who witnessed the murders.
Welcome to Steemit! :)