This is not a SFW instance. NSFW communities will be tagged, and efforts will be made to keep SFW communities clean, but proceed at your own comfort level.
Do we have free will? Did the monster choose to become what he did?
If he still has the power to murder more people, then yes, killing him will be a way to stop it.
https://en.wikipedia.org/wiki/Charles_Whitman is an interesting real world case about free will. His suicide note mentioned that he wants his brain to be autopsied, and it turns out that he had a brain tumor.
Do we have free will? Did the monster choose to become what he did?
If he still has the power to murder more people, then yes, killing him will be a way to stop it.
https://en.wikipedia.org/wiki/Charles_Whitman is an interesting real world case about free will. His suicide note mentioned that he wants his brain to be autopsied, and it turns out that he had a brain tumor.