Weird news - 10 year old boy shoots his mother dead, on trial

These are the sort of cases that both judges and juries dread to have. If you have a murder trial, where an adult has killed another person, you would not feel too much trouble in being part of such a trial, and even if it came to passing a judgment of execution in such a case, you would feel that you have gone through the proper process and done what needs to be done. However, this can get real tricky when you are dealing with a 10 year boy who is on trial for killing his own mother.
Typically, societies consider the age of 18 to be one where a person is considered to be an adult, and more important, when a person is considered of sound mind and capable of being responsible for their own actions. For somebody younger than that, and specially when somebody is like 10 years old, you would think that the child cannot be responsible for their own actions. What was more of a problem was that the 10 year old was in such anger after an argument with his mother, and equally important, had access to a gun with he was able to shoot his mother (link to news article):

An Ohio boy admitted he fatally shot his mother in the head with a rifle when he was 10 after what a relative described as an argument over chores. The boy, now 13, entered the equivalent of a guilty plea Monday in juvenile court. In January 2011, the boy went to a neighbor's house, called 911 and told the dispatcher he had shot his mother at their home in rural Holmes County, about 70 miles northeast of Columbus. "I shot my mom. I shot her with a gun," he said. At the time, his uncle said the boy and his mother had argued over carrying firewood.