Having lived in N Ireland all my life, and worked through 'The Troubles', and having lost more than my fair share of friends through bombings and shootings, I really do understand the feelings these families are going through right now. Asking why a very intelligent PhD student with his whole life ahead of him kills so many and injures so many more, and not mentioning the emotional and mental scars left on so many who weren't even there (the relatives).
There are some very sick individuals out there, who really do need help; 'deranged' is an understatement.
My thoughts and prayers go to the families of those affected. And to the everyday, normal parents and relatives of the gunman, all of whose lives have been ripped apart forever.
We can't think for one moment what might or might not happen to us. As someone once said, 'What is for you will not go by you', and that's just the way the world is. As said I lived through the very worst of troubles over a period of 41 years, and have been closer to bombs going off and shots being fired than is healthy, but I survived, as did many many others. We just have to face reality that when our number is up, that's it.
In the meantime enjoy life to the full; you only get one chance at it...