Conversation so far:
What were Thompson's thoughts about video games?
Thompson has heavily criticized a number of video games and campaigned against their producers and distributors.
What did he criticize about them?
His basic argument is that violent video games have repeatedly been used by teenagers as "murder simulators" to rehearse violent plans.
How well did his campaign against video games do?
Although his efforts dealing with video games have generally focused on juveniles, Thompson got involved in a case involving an adult on one occasion in 2004.
What was the 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.
How did the case end?
Although not representing McCoy and over the objections of McCoy's lawyers, Thompson succeeded in getting the court to unseal a search warrant.
What was in the search warrant?
search warrant for McCoy's residence.
Why did Thompson want it unsealed?
This showed, among other things, the discovery of additional games State of Emergency, Max Payne, and Dead to Rights.
Was Thompson able to show the games influenced the defendant?
he was not allowed to present the evidence to McCoy, whose defense team was relying on an insanity defense based on paranoid schizophrenia.
Did the insanity defense work?
In Thompson's estimation, McCoy was the "functional equivalent of a 15-year-old," and "the only thing insane about this case is the (insanity) defense".
What was the result of this case?
CANNOTANSWER.
Are there any other interesting aspects about this article?
Thompson has rejected arguments that such video games are protected by freedom of expression, saying.

Question: Why did he say this?
Self-contained rewrite: Why did Jack Thomson say that such video games are not protected by freedom of expression?