Rehabilitation is all the rage around these parts, but there are other reasons for prisons. One of the purposes of prison is to protect the public from dangerous people. Another aspect is the instructive element; you send a message to the rest of society about what kind of behavior will or won't be tolerated.

This man should be executed. It would be a fitting punishment for both of those reasons and more. He caused at least one suicide and victimized tens of thousands. This is a crime that calls for the death penalty.