I think it's much better to have them rot in prison. Unfortunately, in the US, we still have the death penalty, and every year, there are people who have been on death row who they find out were innocent. If our process wasn't so slow, we'd have killed a lot more innocent people already. Also, in the US, in some states, people who are mentally retarded or juveniles have been given the death penalty.
I feel that it is much better for someone who has committed an awful crime to spend their life in prison. That way they have the rest of their life to think about what they did. I'll admit, I was glad when Charles Manson died the other day. And I totally oppose paroling any of his cohorts. I'm glad that one woman has changed her life around in prison, but the people she killed are still dead, so I feel she should stay in prison, as long as they're still dead.
I mean, just because I don't like capital punishment, doesn't mean I want any of these killers running around town.