I agree with that.
In fact, I think you could even parse the categories of murderers. A lot of murderers, not the psychosexual serial killer types but a lot of one-off murderers, are actually your lowest-risk people when they are actually released on parole. I think you need to distinguish among them—the serial killers, the sado-sexual and others—and maybe have a very narrow category for the highest-risk people, the dangerous offender types.