My mom used to work at state hospital for the criminally insane. The stories she would tell me about how these people got in there were absolutely brutal. (Canabalism, satanic sacrafices of loved ones, all manor of wierd shit.).
Instead of executing these lunatics, they send them to a "State Hospital" for rehabilitation. It's not a Prison, but a hospital so the conditions are great for the guy who ate his mom. So much so that some of the gang members claim 51/51 and say craay shit to the jury to get sent to a state hospital instead of prison.
The U.S. spends approximately $75 billion per year on incarcerating prisoners... You could build a city, every year for that amount.
Someone who commits capital murder, admits to it, does 30 years in prison. You have robbed them off all life. They aren't rehabilitated, they are just a hardened prison inmate with no chance to make it back in the real world so their only option alot of the time is to do what you've taught them in prison on release. Steal, lie, cheat and do anything you can to try and stay alive. So, it would cost approximately $2.43 million to imprison one person in California for 30 years. (California costs around ~81k per year per prisoner).
Death seems to be so feared nowadays to the point where they can justify taking away any sense of freedom, rights and soverignty and put you in a small cage for 30 years, but yet the death penalty is to far? If i ever get falsely accused of a crime that would send me to jail for life i would beg for the death penalty.