Well yeah but normal people will do it for personal reasons just to get back at the person. A death penalty is supposed to be used Like the saying an eye for an eye.The death penalty gives closure to the victim's families who have suffered.
Then they are stupid. Do you want people going around killing people close to you for something that barley matters? The court/judge decides what will happen and if what they did fits the crime that they are give. Even sometimes it does not turn out like we would like.