Case for the death penalty?

[Royal Tenenbaum]

That isn't an argument for death penalty so much as an argument for giving people life sentences and keeping them in solitary confinement. If he had been kept from contacting people in the outside world, then he would have never been able to order those hits. It's more of a problem with the prison keeping their prisoners in check than an argument to kill someone. Just lock him up and throw away the key.