Interesting. However, there is one big difference between games and other forms of media - interaction. There may be worse in films and TV, but none of them are actively asking the player to engage in the act of killing innocents through choice - the most choice they have is whether or not you actually sit down and watch them as they blink past on your screen. Yet, School Shooter is actively asking the player to hunt down innocents and kill them. In fact, it bases it's entire gameplay on the fact that the player should be wanting to attack those who are unable to defend themselves, until the law enforcement agencies come in and kick their arse. To me, this isn't offensive - it's boring.
A lot of the shock content is to do with how it's wrapped up - shooting innocents in schools. But if you took the gameplay and changed the aesthetics, you'd still have the same game without the shocking context - shooting people who can't defend themselves in a non-threatening environment for no reason. You make those innocents aliens and set it on another planet, and I would say that the shock disappears, and you've got another lame generic shooter that is really pointless.
Thus, it is all subjective - the child killings might be tragedies in the US and the west, where Colmbine and Virgina Tech still hit hard, but what about else where in the world? They don't care so much, nor do we really care about them. If we did, this sort of shock would happen every time there's a game based around killing people of another foreign nation, no matter what. It's all subjective, and it's all about what side you are on. That's why the shock is here, because the antagonistic nature of this mod shows that they are NOT on our side. That's why it's easy to be shocked and attack it.
yet, why should it be on our side? Why should there even BE sides? We create this whole us vs. them to establish our identities, and situations like this occur because of this very simplistic antagonistic approach. When you think about it - you can just strip this of it's subjectivity and realise there is nothing there. But the fact that it's all subjective, yet we treat it as absolutes without realising that it is indeed subjective, says more about us as people than it does about this mod.
The only thing offensive about this mod is the crap gameplay. I liked Super Columbine RPG - it was a very interesting game, and I don't think that these designers actually played it that much, or they probably just hated the genre that is the turn-based RPG. There's much more substance to that game then there ever was to this one - the killing of weak innocents in Super Columbine RPG being grindtastic was more to do with the Genre than anything specific, and set up the premise well. There was actually a point, and a context to the gameplay in that game which the School Shooter Mod simply lacks.