The government has a right to restrict the sale of violent video games, in order to protect law and order.  The government has the right, and indeed the obligation, to impose restrictions that increase the security of citizens and encourage peaceful relations between them. The foundation of the social contract is the state providing security for all participating citizens. If the state believes that violent video games increase the propensity of users to commit violent acts, it is obligated to impose restrictions that will prevent such effects. The rights of individual citizens to do as they wish, and play the video games they like most, however violent, is subordinate to the government's right to increase security through the enforcement of restrictions. For example, one accepts the government's right to restrict what we carry onto aircrafts in order to prevent violent attacks. That is not to say there aren't limits to what we can carry on, just as violent video games are still available to adults we can still carry laptops and mobile phones onto aircrafts. Ultimately however, it must be accepted that the government's right to protect society includes a right to restrict the sale of violent games.