In response to PP - the death penalty is NOT a deterrent. Anyone suggesting so is woefully ill - informed and has not read any of the extensive research.
The US uses the death penalty in many states and has some of the highest rates of violent crime in the world. It also incarcerates more of its citizens than any other country.
The death penalty and harsh sentences do not make any difference to crime rates. In fact if you look at the US - it makes it worse.
The reasons are multi-factorial but it's possible that a factor is the society as a whole. Why would you respect a government or society that places so little value on human life?. Why would you be non-violent in a society that practises the most extreme violence as a justifiable and approved response to anothers behaviour?
Why would you abide by the laws set by a society that proves time and time again that they will kill you or take away your entire life and not take into account that you were young or stupid or abused or ill or poor. Why would you respect a society like that?. I'm not saying this is my view but I think it's a valid one.
The US can't execute minors so they use life without possibility of parole for CHILDREN. The youngest in recent years was 13. His case is being appealed but the judgement was still given and didn't result in a national or international uproar. And it should have.
Google Andre Thomas - convicted murderer who's crime was so extreme he was clearly psychotic (i'm also also MH professional). He removed one of his eyes with his bare hands while awaiting trial.
He was still found guilty and sentenced to death. He removed his remaining eye and ATE it in response to delusional ideas while on death row. Only then was this now blind and obviously mentally ill removed to a Psychiatric hospital.
Appeals are being processed but he retains death row status and by implication, waiting for an execution date.
There is nothing that anyone can do that will ever justify the death penalty. Any society that utilises it, condones or doesn't challenge it is inhumane, vengeful and frankly fucking stupid.