There is another reply from me, on this, on another thread, but...
Whoever did this, we MUST take a thourough look at his way of thinking.
I think so because if we get to know that, we can recognize it next time.
Well, maybe, i think the shrinks (nothing personal

already working on that.
This could have been done by a lot of people.
For example, the incidents in the U.S. whereby young people shooting people in their surroundings. Ex-employees who gun down their ex-collegues.
It's a brain thing more than we can imagine.
Humanity is loosing it's identity and we are so much looking for it.
We are loosing track.
I truly hope this tragedy can teach us all.
Every innocent human who dies is a terrible waste.
Sincerely,
JG5FaBi