A defendant was acquitted because he did not know the nature and quality of the act he was doing, or that he was doing wrong. What we have here is an instance of the:

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The M'Naghten Rule is a legal standard used to determine whether a defendant can be held responsible for a crime due to insanity. It states that a defendant is not guilty by reason of insanity if, at the time of the crime, they did not understand the nature and quality of their actions or did not know that what they were doing was wrong.

A Defendant Was Acquitted Because He Did Not Know the Nature