I agree with Phil that there is a proportionality issue here. Death is too good for these creeps. Crimes such as rape, regardless of the age of the victim, cry out for Arabic justice: steal once, lose a hand, etc. Seems a return of the stockade is in order here. This one, not the Fort Apache kind.

http://www.knightsedge.com/medieval-weapons/medieval-stockade.htm

A very, very long time in the stockade seems proportionate to the emotional stockade in which the victim must live out life. Proportionate.

"The white men were as thick and numerous and aimless as grasshoppers, moving always in a hurry but never seeming to get to whatever place it was they were going to." Dee Brown