That logic is weak and frankly pathetic. You are trying to rationalize a horrific act by focusing on the criminal’s internal state rather than the objective reality of the crime. Murdering children is an absolute violation of nature and a total collapse of parental responsibility. Society has a duty to remove those who commit such monstrous acts, not to concern itself with whether they feel guilty or not.
Justice is not about your misguided desire to see someone suffer in a cage so you can feel better about “punishment.” Justice is about restoring order and showing that certain lines cannot be crossed without paying the ultimate price. Stop prioritizing the comfort of a murderer over the cold, hard necessity of absolute justice. Your take is nothing more than a cope for the weak who are afraid of true retribution.