dissecting this, a couple of fun thoughts:
1. Even assuming that the studies she links conclusively proved that video games correlated to violence (which they don't) none of them say anything about a propensity towards rape or sexual abuse being connected to games
2. the paragraph she spends blowing her own horn is about "media violence" in general, lending nothing to her actual credibility. Stephen Colbert testified in Congress, does that make him an expert on migrant workers?
3. Claiming further than a new theory was "assumed" is a terrible idea. Any scientist, any academic (like me, even as a humble sophomore) could tell you that even if it's a well known topic, you start with an introduction. You explain the history of your topic, and any notable research in the field. Imagine if every scientist who discussed evolutionary theory simply stated "well I assumed you knew every detail of this topic, I filed away my data already". In short, it's poor form under the best of lights, and given how off point her supporting evidence is (a manifesto is an opinion, not fact), this makes her even less credible.
4. Finally, citing an opinion poll of people who blamed "media violence" on Columbine proves nothing. Once again, that's just what people think, and has no actual basis in fact. Furthermore, part of that effect could doubtless be blamed on the media itself, and on people like you who helped to propagate the theory. Society is a mirror reflecting what the media shows it, and sometimes it's the other way around. Think of the many killers who've plagued our schools and our streets over the years, how many were directly affected by gaming?
Sorry Dr. Lieberman, if you want to make a horrendously offensive claim about our form of entertainment, bring your A game. Better yet, just do your homework.