ESRB going a little to far?

Before you post, read this. http://www.gamasutra.com/php-bin/news_index.php?story=14454

If you have been on this forum for the last few days or weeks you will undoubtly know about what happened to manhunt but now Dark Sector and even a old Gears of War trailer are under ESRB's Scope. I'm a bit tired atm but honestly, I think ESRB has done good with mahunt (just my opinion) but I think that forcing game companies to get rid of gameplay videos (and maybe even demos later on) just because it features violence they can't describe in there lackluster ratings is kinda unfair in my opinion. Well, i'm sleepy, night everyone.

It also leads to another question - if gameplay videos aren't allowed to feature violence, why are horror movies allowed to advertise violence?