This game has moral choices. Throw a few in there with no clear right or wrong answer.
For example. (fell free to tweak it for the appropriate atmosphere)
There is a far off speeding train that is out of control. Tied to the tracks is are about five or six people. You do not have enough time to go down and untie them. You are standing on a bridge that goes over the train tracks. Standing on the bridge with you is a fat man.. a very very fat man. If you push him off the bridge and onto the tracks, the fat man will die and you will have murdered him, but his massive girth will stop the train thus saving the people tied to the tracks. If you dont push the fat man, you are leaving all of those poor helpless people to their fate, letting them all die which is close to murder.
Doing something like this creates an atmosphere of helplessness and an immediate need for the player to rationalize and make excuses for their choice on a hard decision, as would anyone in a survival situation eventually have to do when they need to make tough choices.