Protesting "Bully" for immorality?

With the release of "Bully", a new game from Rock Star Games, a group known as "PeaceOholics" were found in front of a Best Buy protesting the sale of this game. Not only are the parents of this organization are sending their kids to protest for them, they are also making a few demands for Rockstar.

Peaceoholics List of Demands for Rock Star Games

Not to release Bully under any circumstances

Volunteer to sell its violent and sexually explicit games in adult video stores only.

Let parents return Grand Theft Auto for a full refund until they do a national awareness campaign to educate parents of content and possible effects.

Create a fund for victims of unauthorized use of a motor vehicle and car-jackings, etc.

Make a national apology for misleading and lying to children, parents, and legislators about their intentions and causing insurance premiums to sky rocket.

Give a written response within five business days of receipt of these demands.

Now I can understand their argument against selling "violent games" to minors. But why are they protesting only "Bully" and not "Halo", "Battlefield 2", and "Mario Cart Double Dash"?
Yes, I said Double Dash. Is not shooting "shells" at your target considered violent? Although this example is a very mild one, it is non-the less a violent one?
Here is the link to their protest