There's nothing you can do to stop it, no. There will always be sick people in the world. The people in this person's neighborhood should be aware of it, because it affects them to have this person living near them. They need to be made aware of it so they can make sure that those people get what they deserve. The police should be aware of it, because they can and should stop it from happening. But why does the entire nation need to be aware of it?
It's put on the news to shock people and to make people emotional. And if something makes you feel very angry or very sad, it makes that bit of news seem "important". This bit of news is not important, in the sense I don't need to know about it. I know there are sick people in the world, I know people hurt each other, etc. etc. I don't need to know about this particular case; I don't need to know the graphic details. No one needs to know that.