I wouldn't. You'd need a pretty important sentiment to be willing to exploit the tragedy, and it doesn't easily fit into a video game. You'd be shoehorning the subject to the genre, and why you'd want to depict the subject is beyond me.
If you've got a message, the game's still probably offensive to those killed. Bad move.
If you don't have a message, why the setting? Controversy seeking?
There's no world in which your work is suspect for exploiting tragedy. So it'd better be a fucking masterpiece, even to a Luddite.
And I really don't think there's much of a message you can explore through a video game. Certainly not one that would be in any way enjoyable.
The act itself is not the subject for a game. The act of butchering children, in a time when it happens all too frequently, shouldn't be a part of the game, whichever side you're on. If you want to do it allegorically, like say
The Path (Suggestion stolen from @Katatori-kun), it could work, but if you play it straight, it's not going to be great. If you play as children running away-you cheapen the real story. These people died. Most of them without a chance. A game where you run from a caricature of a gunman would be as repugnant as one where you wielded the weapons yourself.
There's no way to make a game about police taking them down. First, that's not the way it usually works, and second, it'd be a rubbish game. Did you see the response to these events? More assault weapons than you can shake an AR-15 at. It'd be a boring game, and it'd also be meaningless and trite. Oh look, you killed the bad guy. Now how about cleaning up these dead kids. As meaningful as "Beat up Bin Laden" style games. Pointless Catharsis for the intellectually deprived.
The only way to make something with a point (Because the theme of Gun Control is not something that you can easily tie into gameplay), would be something I got Ninja'd to:
The_Blue_Rider said:
Have it be a VN almost style game where you dont play as the shooter, but instead play as the shooters friend. Over the school year you can see various things that cause the would be shooter to fall into despair and see what would be his motivation for doing such an act. Your decisions can either help him/her and prevent tragedy, or you could inadvertently worsen the situation.
I think it could be kind of interesting
A character piece, a psychological breakdown of humanity. The shooting itself should not be anything to do with gameplay. How you would mechanise that would almost certainly be repugnant. Instead, thinking about the actual issues, you could make something with a real heart to it, but you'd have to be a real genius, because this either is done perfectly and is amazing, or sub-par, and is terrible, and labelled as exploitationist across the board. You can't just come close, like Spec Ops did, and get away with it due to the absence of other media doing the same. You'd have to get it perfect, first try. It'd be a series of conversations, and interactions. Think The Walking Dead game, or Mass Effect conversations, or the like. Examine mental health, sanity, and the process one needs to go through to be able to see his fellow humans as acceptable outlets for their rage.
thejackyl said:
3. Pull a Spec Ops: The Line, but handle it differently. You believe you're going into the school to stop monsters or something, and you go through cleaning out the place of different monsters. Some who walk towards you, some run quickly, some run away, some hide and jump out. It's later revealed that the monsters were ACTUALLY innocent people, and that you are really at fault. And unlike Spec Ops, you aren't a good person who unknowingly did bad, it wasn't in self defense, and you ultimately had no reason to kill everyone.
Yes that third one is a bit horrible in retrospect, but I think it would have a bigger impact than Spec Ops, especially if it was marketed as if it was a game like Painkiller or something. (Kind of like how Spec Ops from its appearance looks like another "Bro Shooter"
I think that one comes close to the song "Hammerhead" by the Offspring. http://www.youtube.com/watch?gl=AU&hl=en-GB&v=TdbrxHLhOn8
There's a few different interpretations floating around, but I always took it to be about the perils of just doing what you're told, whether by authority, or your own desires. To complete the analogy, I wouldn't use Monsters, but "Terrorists". But, that's a bit harsh for a videogame. The school shooting then just becomes an example or allegory, which for videogames, with their current standing, is a bit too much to pull off.