Makes perfect sense, obviously. Because clearly killing a murderer will fix everything that they've done and will bring the dead back to their family. Clearly it's not just a waste of life and an easy way out for everyone involved, including the murderer.
Allusion: I think the utopia is referring to the Bible.I think the utopia refers to the garden of Eden I think which is a utopian society. I think the author put this allusion there to show a perfect world and to basically show how they are alike.