yeah but this is reality, not fantasy
Life for the euphoric: You lock a man up in a six or eight foot cell. You pay 60,000 US dollars are year to feed and cloth him a year, and to watch him go insane every minute until he either kills himself or dies in his cell over a long period of years. Only to teach him a lesson that killing someone was wrong, even if he admits his guilt or says he is sorry he will be trapped in that cell forever until that heart of his stops beating.
Death for the euphoric: You avenge the death of somebody and kill the murderer with an injection that costs about 86 US dollars that puts to him sleep.
Both choices have their perks and the major flaws. While eye for an eye is barbaric, housing every single of those guys is going to come out of your pocket, and it's going to be a lot. The prison population is overcrowding, we continue to build more prisons. Those guys on life sentences or on death row are or were major scumbags.
Locking someone up doesn't fix the problem, killing them does little, you have an overcrowded prison population, a government with a huge debt and currency backed by nothing, people are getting out doing still committing crimes. You could try to change people, but only you can decide if you want to change. Perhaps we need to reform? Do we lock them up, and call it day, do we remove the dangerous people from society by killing them, or do we punish them by locking them and trying to change them. If experience taught me anything, you can't change a person, only they can decide that internally. If you do want to try and change someone, what would you do? Any expenses?
There is no magic bullet, no one right answer, no guarantees. This is the way things have been, this is the reality we live in.