I believe rehab should be used more. Personally I think Murder, and Rape are the worst crime, and Terrorism of course. I think Terrorists should be executed, just to prevent their allies from coming to spring them out, but then again Terrorists can be useful they can have valuable interest.
But anyway for murderers I think the case should be investigated. For example a kid abused by his parent who pulls the trigger on his dad..I think they should get rehab. Then there's the case of people who have means for murder, I don't think murder should be a life sentence. Everyone makes mistakes, but then again a serial killer, or mass murderer or something of that magnitude should get the penalty. People like that rehab won't do them much good in my opinion.
Life Sentences cost too much money to support, if someone has a sentence then they should be getting out, life is just wasting money. People in prison get 3 meals a day, and homeless are starving it's just no. Rape..I think it should be a case of innocent until proven guilty, too often innocents are framed for rape. But if proven guilty penalty, they'll be murdered in prison anyway, same with child molestors.