I don't buy the notion, passed off as a ready platitude by many here, that the wishes of victims' families should have any bearing on what happens to the offender. Apart from the extremely dubious nature of using the offender's life as a means to satisfy the family's desire for "closure", whatever that means (and it's a fairly recent invention), such an idea would essentially set up a two-tier justice system: harsher penalties for those who kill people with families. Are proponents of this system willing to say that lonely murder victims deserve less exacting justice than those with surviving family? If not, it cannot be suggested that victims with family deserve more exacting justice.
Further, the entire appeal to "victims' rights" similarly perplexes me. Obviously the victim has rights-- the right not to be killed is the sole reason the killer is prosecuted. That there is a consistently applied injunction against murder at all is a massive affirmation of victims' rights. However, victims do not have the right to short-circuit the proceedings of justice against their killer, or to dictate brutal punishments without regard for fairness or humanity. In short, a victim's considerable rights end where a killer's relatively few rights begin. Even a psychopath is entitled to due process, a considered verdict, and an humane sentence, and no contrary desire imputed to the victim or held by his family can circumvent this.