I've watched a few shows like Reign, Criminal Minds, and Hannibal and I've seen a couple of episodes in which a character's mind was influenced by a brain tumor (or at least the symptoms would point to that such as headaches coming and going and claiming that their minds were sharper then ever and suffering hallucinations) in all three shows each character was influenced by a tumor in one way or another.

This has led me to wonder if a person suffering from a tumor and is influenced to commit murder because of that tumor could really be held accountable for those crimes. I realize there is no excuse but I feel that if a person is influenced by a tumor something beyond there control and is not even completely aware of it assuming they are even in a state of mind to tell reality from madness.

I can't help but wonder if someone like that should really have to spend life in prison for something not entirely their fault.