If anybody's confused about what happened in the video...
You are CIA. You've infiltrated a terrorist group who happens to like massacring people (in this case Russians, I believe). This terrorist group may be Russian itself (hence the 'No Russian' comment, likely indicating not to speak the language), but they apparently want a dead American corpse there so that the Russian authorities will accuse the US of being directly responsible. They want a war between the two nations.
As for why it's so shocking? Easy: Grand Theft Auto is almost cartoony in the way the games portray violence. This is much more realistic in gameplay and portrayal. There's a level of depth here than can be frightening to many people.
What I'm shocked about is Soriku finding it 'badass'. So, killing that many unarmed people is badass? Are you being serious here?
The BuShA owns all!
