Life in prison without the option of parole. Or, if the murder was caused by something like a psychotic episode or drug withdrawal, therapy in a closed facility.
I don't mean to be asshole. It's just that the general moral decay from these things is the absolute worst that can happen. Most people don't think about it with all the focus in the current criminals and victims. Not the future of society.
In my understanding the future of society is exactly why there is penal code in the first place.
There would be many things to say, but I would be already incredibly happy if you would realize importance of this small aspect.