It doesn't get any sicker then this.

[rory_20_uk]

Sane or insane, lock him up and throw away the key.

Death is a release, not a punishment, and some horrible torture would say more about us than him.

Locking him up is a waste of resources. There's also a risk he could escape. He can't if he's dead.
A 20 year old would be on average a great candidate for organ donation. The remnants that can't be reused can then be discarded.