Hm, do I think violent video games are a factor in violent behavior? Not really, no more than cartoons were a couple generations ago or heavy metal a generation ago. These things are figments of uptight people's imaginations.
However, since this is the law, Blockbuster should not be more concerned about repeat illegal buisness over following the law. So store need to be held to the law, however silly it may be. A law that makes breaking a previous law illegal does nothing, obviously the first law was not enforced.
The only people that are affected by such things are already inclined to some level of violence, whether through ignorance (a knock in the teeth should cure that), stupidity, or other issues.