Many people believe that the death penalty would be cheaper than life in prison but that is not the case in the US and we would probably have a similar model. For those interested enough, this lengthy article explains why
https://www.leg.state.nv.us/App/NELIS/REL/76th2011/ExhibitDocument/OpenExhibitDocument?exhibitId=17686&fileDownloadName=h041211ab501_pescetta.pdf
We condemn those who murder and torture. These monsters believe they have the right to do what they do at the time that they do it, whether that is a spur of the moment rage, a long planned attack or simply for perverse enjoyment.
We believe they are monsters, evil.
Those that are in favour of the death penalty also believe we have the right to kill, they want somebody to become a cold blooded killer.
I would much prefer those monsters to see every day the contempt in other peoples eyes, live with the consequences. Some lifers want to die, to escape. Death is too easy for them.