I'm afraid it may be like the proverbial lightbulb ...
How many top-heavy institutions, starry-eyed psychologists, hard-earned tax dollars, manipulating doctors, and social-working do-gooders, does it take to change a killer?
One, the killer must do it. How then do we as a society ensure that the lightbulb will not go out again.
We can't. We will have to start again, when it does.