I am sorry for what appears, tragically, to be your great loss. I know that it is easy for someone not directly affected by a tragic event to say it, but it is no less necessary: please try, however difficult it may be, to not let this horrible series of events lead you to embrace measures that will irrevocably change our way of life. This is exactly what the perpetrators of these incidents wanted - don't give in to them, or to your very natural feelings.
Again, I am sorry for your apparent loss. G-d bless you and your family.
I don't think that he was ready to embrace anything. Just wanted a little while to grieve or sort this out or whatever. And reading some guy's thesis on "not letting this change us" isn't the best way to recovery.