@Brodehouse: What free speech are we giving up? It's the announcement of a study.
Wait for it.
I think you're being a bit paranoid. More information is always better and even if they found that violent videogames do cause real violent behavior (extremely doubtful), that does not translate into a repeal of the 1st Amendment or anything like that.
I, for one, am glad they're doing this. Government research will have more credibility than any other private institution. They will of course find that there are no significant links between gun violence and violent media and, while it probably won't shut up everyone, it will mean video games will be less of a scapegoat in the future.