Let's say it this way: imagine it was not prison, but a full therapy treatment and rehabilitation. Do you think that 3 years is enough to rehabilitate an adult

Let's say it this way: imagine it was not prison, but a full therapy treatment and rehabilitation. Do you think that 3 years is enough to rehabilitate an adult that all the events in life lead him or her to kill somebody ? Some people take 10 years to quit smoking. Also, while I agree with your point on abusing the justice system and not using it for revenge, you must not forget that: - currently we also use it as a deterrent system. Even if it doesn't work very well. If somebody is capable of killing someone else, there is a huge different between knowing you will pay 3 years or 10 for it. 3 years to get a reputation or get rid of a life road block could be calculated as an acceptable price. - there is also the way the non-killers will see the system. If people are being honest, and they witness more and more than being a criminal has not the consequences they though is should have, then people will loose any trust they have in the system. It's a very bad long term side effect to have for a society. Really, really bad.