Conversation so far:
What were Jack Thompson's thoughts about video games?
Jack Thompson has heavily criticized a number of video games and campaigned against their producers and distributors.
What did Jack Thompson critize about video games?
Jack Thompson's basic argument is that violent video games have repeatedly been used by teenagers as murder simulators to rehearse violent plans.
How well did Jack Thompson's campaign against video games do?
What was Jack Thompson's 2004 case about?
This was an aggravated murder case against 29 year old Charles McCoy, Jr., the defendant in a series of highway shootings the previous year around Columbus, Ohio.
How did Jack Thompson's case against Charles McCroy Jr. end?
McCoy plead guilty to involuntary manslaughter and 10 other charges, and was sentenced to 27 years in prison with no chance of being released sooner.
What was in the search warrant Jack Thompson had unsealed during the Charles McCoy case?
This showed, among other things, the discovery of additional games State of Emergency, Max Payne, and Dead to Rights.
Why did Thompson want the search warrant in the Charles McCoy case unsealed?
The search warrant showed, among other things, the discovery of additional games State of Emergency, Max Payne, and Dead to Rights.
Was Jack Thompson able to show that games influenced Charles McCoy?
Jack Thompson was not allowed to present the evidence to Charles McCoy, whose defense team was relying on an insanity defense based on paranoid schizophrenia.
Did Charles McCoy's insanity defense work?
What was the result Charles McCoy's case?
McCoy plead guilty to involuntary manslaughter and 10 other charges, and was sentenced to 27 years in prison with no chance of being released sooner.
Are there any other interesting aspects about the Charles McCoy case?
In Jack Thompson's estimation, Charles McCoy was the functional equivalent of a 15-year-old, and the only thing insane about this case is the defense.

Question: Why did he say this?
Self-contained rewrite: Why did Jack Thompson say McCoy was the functional equivalent of a 15-year-old, and the only thing insane about this case is the defense?