I am a sort of advocate of the sort of treatment you guys are saying but there are some rather large issues that need addressing first. While we lived in the US a couple of cases made the papers that make you stop and think.
1. A 17 yr old part indian boy in one of the southern states was arrested, charged and convicted of the murder rape of a 7yr old. He spent 9 YEARS on death row before the real story came out. He was hated by the local sherriff, for no particular reason as he had not been a juvenile offender, and the sherriff made up all of the evidence against this kid. When the kid was arrested they put him into a cell next to the person who had really done it, who was in there on charges relating to another incident. They nearly put this kid to death and his only crime was being hated by the sherriff. If the above posts were performed he would not be alive/entire but yet he was innocent.
I beleive without actually having a source for the statistics that about 10-20% of the exocutions in the US are wrong. Another point is that this crime you talk about is the only crime that simple accusation is regarded as proof and nobody will beleive otherwise.
I have children and the thought of someone doing this to my kids makes me so mad you would not beleive, but there is a reason the Magna carta took payback out of the hands of individuals and I do think that lifetime solitary confinement is more horrible than just about any other punishment we can come up with. At least if we find out that they were innocent we know where they are.