Certifying/banning movies, games, the news, etc
It's worth considering what the sales ban is all about before asking why other, equally violent media are allowed on our screens.
Cinema's generally don't allow kids in to see films like Hostel, Saw etc, so here you have a way of imposing the certificate in order to protect youngsters, as we should.
DVDs are trickier and, like games, can easily be purchased by an 'adult' who then passes them on to kids. Balancing the right of an adult, who can be supposed to be able to make a rational decision about what he or she watches, with the need to protect kids is incredibly hard, and debate on video has been raging since the early 1980s and still hasn't been resolved. Nor will it ever, I think.
Generally, the BBFC is tougher with video certification than movie certification - demanding more cuts, for instance - because it knows how easy it is for 18-certificate videos to fall into the hands of children.
So why not let Manunt 2 out with an 18 certificate? Two reasons. First, as the BBFC said, the game simply can't be cut to make it certifiable. Many, many movies and videos are not given even 18 certificates until cuts have been made. The studios make those cuts, and onto the shelves go the videos.
But there's something more important here than mere cuts: games are not videos. Watching a movie is, largely, a passive process. Playing a game is an active one. Watching someone die horribly with spiky things in their heads is not the same things as putting the spikes in yourself, albeit virtually. In one you're a voyeur, in the other you're a participant.
Now, what about gunninng down people in a first-person shoot-'em-up? Surely that's no different than Manhunt 2, and that's allowed? No, because the context and setting is very different.
You aren't going to meet Nazi stormtroopers, aliens, monsters, zombies etc in real life, so there's no assocation between the game and the real world. Manhunt 2's problem is that you prey on people who are very difficult, visually, to distiguish between folk in the real world. We grown-ups can appreciate the difference, but it's not at all clear young kids can.
My four-year-old thinks Doctor Who is real. In a few years he won't but he probably won't necessarily make the same distinction with a 'realistic' show like EastEnders. Or Manhunt 2.
As for the news, again its about context, and there are plenty of things broadcasters are not permitted to show, and why we have the 9pm watershed. Like DVDs, it's impossible to be sure kids aren't seeing inapproprite material, but crucially not of it is interactive in the true sense.