This perpetuates a common fallacy around criminal justice: the idea that there is a class of person called "murderer" who just goes around killing people left and right.
Now, it's true that there is a class of person who meets this description, but we don't call them "murderers". We call them "serial killers", and they're incredibly rare.
Decades of propaganda (some subtle, some overt) has put this notion of "once a murderer, always a murderer" into our collective consciousness, but in the vast majority of cases, that's not true at all. Almost everyone who commits murder has some clear, specific reason to do it at the time, and we would be much better served as a society if we would push harder for addressing those reasons (which, from what I understand, almost all come back to either "proper therapy/anger management" or "providing proper support for every person's basic survival needs") rather than expecting punishment to make people better.
Now, it's true that there is a class of person who meets this description, but we don't call them "murderers". We call them "serial killers", and they're incredibly rare.
Decades of propaganda (some subtle, some overt) has put this notion of "once a murderer, always a murderer" into our collective consciousness, but in the vast majority of cases, that's not true at all. Almost everyone who commits murder has some clear, specific reason to do it at the time, and we would be much better served as a society if we would push harder for addressing those reasons (which, from what I understand, almost all come back to either "proper therapy/anger management" or "providing proper support for every person's basic survival needs") rather than expecting punishment to make people better.