Dezaad
[the state of being] unable to appreciate the nature and quality or the wrongfulness of [one's] acts
Bodisatva: Do you contend that the above defined state never exists in (adult) humans? Yes
You have stated that Murder is so irrational that it is inherently insane. Yep But, surely you are not saying that all Murderers fit the legal definition. Yes, I am Instead, you are saying that no Murderers and therefore, no Insane People, fit the above definition, correct? I cannot even fathom what this means, that seems like the complete opposite, and in my tired state, that seems to make no sense at all.
You base your rejection of the possibility of the legal definition on what? I don't. I think that it should be enhanced to include All Murderers or Abolished so that a new definition can be attributed to Murder.
Is the following your argument? Because Murder is inherently vastly irrational, it is insane (meaning not of sound mind; mentally deranged). Yes Some people who commit murder are able to appreciate the nature and quality of the wrongfulness of one's acts. Irrelevant. Therefore, legal insanity (meaning unable to appreciate the quality or the wrongfulness of one's acts) cannot exist. Legal Insanity might not exist, I am not sure what you are getting at there...but the Insanity does exist...
This argument falls apart because it is possible that only some of the people who are "not of sound mind; mentally deranged" are also "unable to appreciate the quality or the wrongfulness of one's acts", and that the remainder are not. This remainder may be responsible for some of the murders. That is just it. Responsibility is Irrelevant. It is understood that they are Insane for committing such an act and therefore understood that they are Insane. Appreciating their crime or understanding the wrongfulness of it is Irrelevant. They did it. It is done. They are Insane. They Murdered another. They should be punished accordingly...
The difficulty in understanding the failure of the argument is due to using two definitions of insanity in a single argument.