The same applies to America, her freedoms, and insane acts of violence.
Laws that support, life, liberty, and property are right and proper. Many laws act as a deterrent and will stop people on the margin from doing bad things...this is akin to diversifying away the non-systematic risk. Thus laws criminizing murder, are right and proper.
However, in a nation like America where freedom reigns and the individual trumps the collective, the risk of a maniac going on a killing spree like in this story, is Undiversifiable. It is idiosyncratic.
The adults in the room understand on some baseline level, in a relatively free society of 330MM people who are LARGELY civilized, you'll ALWAYS have a few pathological maniacs who will shoot up a club, derail a train, etc.
Thus, random acts of violence, are the Undiversifiable/systematic risk of a free society.
Sure, maybe some laws can help, like liberal application of the 2nd Amendment and concealed carry. But uncivilized folks will act uncivilized.
The political class and purveyors of Authority Bias want you to think the idiosyncratic risk of a free sociey CAN be eliminated, via shredding civil liberties, e.g., we can eliminate “gun nuts” by welding a GoPro to the heads of 330MM people with central monitoring in DC. AND EVEN THEN that wouldn't be perfect...after all, people in jail still get drugs and weapons.
You can't stomp out ALL bad folks. THAT is the ugly truth.