In other words, violent videogames are neither sufficient, nor even necessary for violent behavior, but can, at most, be considered as a merely possible contributing factor by providing one possible alternative for desensitization for those who are already prone to sociopathy/psychopathy. I agree. All the research is on aggression NOT violence, and although the two are obviously related, they are by no means interchangeable. Right-winger censors will never get far by showing that violent videogames cause actual violence because they quite simply do not. They may partially contribute, but so can many other factors, and thus they cannot on that basis alone be censored. This is more or less my theory as well.
The real question relates not to the FCC but to practicing psychologists like Dr. Mark. The question is; "are violent videogames a healthy activity for this individual" and must be thus applied to INDIVIDUALS, not to society. I imagine the question is answered differently for each individual, but there may also be general rules that we may glean from treatments, such as "allowing children under the age of 15 to play violent videogames increases the probability of those children having more social issues, or resolving social issues with aggression" just as a hypothetical example. But even if this were the case, it would only warrant pamphlets and ad campaigns to make parents aware of this tendency because the said effects are not dangerous, and thus do not even remotely fall under the "shouting fire in a crowded theater" clause of the First Amendment. And if some effect like this were actually proven there SHOULD be an awareness campaign. It's my understanding that awareness campaigns are almost always more effective than direct censorship, with the added benefit that developers won't have to worry about a $1000 fine every time a clerk sells an MA ranked videogame to a minor, because the parents will be doing the job instead of the District Attorney. (I am of course making reference to the California bill which would make it a crime to sell to minors.)