It would be best to tell the story and background of the world through books and articles in the game, giving the player a minimal amount of text that is given to him directly. Also npc's are a good way of telling the backstory of the world.
When crisis like this happens people become scared and savage. We should give the impression that people don't trust anybody, are scared, and are out in the streets shooting people for food. Law enforcement should be there, but weak compared to the mess they have to clean up, so it's almost like they give up.
The taskforce should have players guessing whether they are moral or not. I also like the idea that the task force should have more control than they are supposed to.
The world should always keep the player on his toes. Remember when first playing quake and that monster jumped through the door and almost killed you, and how from then on you always backed away from big door while opening them? Thats what the world should give the impression of.
you know we already have http://perceptioncrash.sourceforge.net/ ... ngame_Text