Maybe it's your perspective thats wrong...
I really don't get the outrage, no one complains when a movie shows a terrorist act and then the hero tries to stop/catch/kill them and i don't see this as much different.. It isn't giving ideas to terrorists (no more than movies) unless terrorists have zero imagination.
In the game you are trying to infiltrate the terrorist group so you act like them to prove you are one of them and by doing this you screw everything up beyond belief. The message i got from the level was that if you have to become as bad as terrorists to defeat them then things will only get worse.
I can see how russians might be offended, not by the violence but by the way it shows the populance as being stupid enough to blame an entire country for the acts of a couple of extremists (or by the way they are always bad guys in modern games). I would be offended if they displayed british people as mindlessly blaming an entire nation for the acts of some wankers..... oh wait.
@synnercal; Yes i did that (didn't fire a single shot), you don't even need to kill the police, grab a riot shield from a police officer (let one of the terrorists kill one) then you can walk through the level without killing anyone.