I guess I was more commenting on the general sentiment that rises when stories like this pop up: "destroy the perpetrators, then we can all feel sated" instead of "what's the best way to prevent this happening again"
Prevention is generally ineffective, because it's usually done through regulation. How would you even prevent something like this? I could see creating a law against this specific case, but that would be for a very limited corner-case. I generally don't like the "prevent every bad thing possible" approach to rules and laws, since there's so much to regulate. It's easier to punish bad behavior.
