I think that this line of thinking is part of the problem in the US. The lack of capital punishment in Norway is a feature not a bug, and if you look at the results it's a good feature. Norway has very low crimerates compared to the US, far fewer homicides and almost no problems with guns and violence.

The Unites States has a mentality of punishing the perpetrators, often very hard, in order to gain revenge and maybe act as a deterrent to others. This is why the US is one of the onlycountries in the world that use capital punishment, and the country in the world where most people are in prison.

Unfortunately research shows that this doesn't work, as evidenced by crimerates and homicides in the US. Norway takes a different approach, and instead of looking for revenge they ask "how do we prevent this from happening again". This is why there is no capital punishment, why you see drug offenders in nice rehabilitation homes, and why Breivik was convicted like any other murderer within the Norweigan system.

The Norweigan system works, and the American doesn't. Just look at the numbers.