That's the real problem: there is a dearth of reliable intelligence on the subject.
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Another part of the problem is that the only real people interested in disproving the video game violence myth are those working with the industry. As a result, much of their research is immediately discarded as being biased, despite having good scientific methodology. Yet people like Anderson are given a free pass despite concluding an increase in violent crime in todays youth. He cites the surgeon general's assessment, using one particular graph for one particular type of crime, with one specific age (18 IIRC). Despite the fact that a few charts later, in the very same Surgeon General's warning (I think it's one of the links I gave too), the SG concluded that on the whole, violent crime in today's youth has decreased.
There's also other correlations, such as the increase in youth crime follow the increases in illegal arms distributions in the late 80s and early 90s.