Comment by Cthulhu_

The main thing is that there's a difference in perspective. In e.g. the US legal system, prison time is punishment, a form of vengeance, of paying your debt to society. (and nowadays, a means to get a large slave labor force). In NL and Finland and the like, prison is more like forced rehabilitation - it recognises that committing crimes have a reason, and by solving the reason you solve the criminal behaviour.