If the state wants to restrict "M" rated games to people 17+ (or people with parental consent) that's fine, however going any further than that is wrong. It should be up to parents to decide if children are ready to play a game - not the state.
I've been playing games (violent and non-violent) since I was 7 years old - one my first being C&C: Red Alert - but I'm not a violent person - heck, compared to 90% of the people Xbox Live, even people older than me, I'm an incredibly calm person. I get A's and B's in school, and I'm in Dual-Enrollment (College Classes in highschool classroom).
My point is that everyone's different, and it's not up to the state to decide who can or can't do something. If they want to prevent violence related problems, they should try to educate parents, not ban the games.
Here's an idea - make a website availible to parents that contains more in-depth ESRB-type information. Include more than four words why the game was rated how it was, include screenshots, etc. I can imagine it being difficult for a parent to jugde the content of a game based off of 4 words and this type of information could definately help determine this type of issue.
For example, for a parent who doesn't recognize the titles so they don't know about the type of games they are: Gears of War and GTA4. Both are Intense Violence with Blood and Strong Language, but one is shooting aliens while the other you're shooting other people over money. It's reasonable to say that if a child were prone to being mentally effected, GTA4 would have a greater impact. But a parent wouldn't be able to judge this off of the esrb.org site.