Just so everyone knows, there are actually children in the game! Well at least in the start. In the first few minutes of gameplay, people can see a child waving at the protagonist after he was stabbed with a needle by a tall masked man. Immediabtly the masked man looks at who the boy is waving to and closes the blinds so we cannot see anymore. This is a big clue I believe, yet I cannot solve the puzzle. Another theory I heard a lot about was that the terrible thing the Wellingtons did to the invading Germans was surrender! Joy is then used as a drug to pacify the citizens and make them believe they are at peace and all is well. Just a theory.