After this thing the other week here's some actual science proving actual things. Specifically: "'immoral' virtual behaviors in a video game can lead to increased moral sensitivity".
You can read the full abstract (via MCV/Polygon) below but the short version is that scientists across New York, Michigan and Texas universities tested gamers after playing a video game (in this case actually Operation Flashpoint: Cold War Crisis) and found them more 'morally sensitive' and prone to guilt. It backs up previous research making similar conclusions and argues that games could have 'prosocial consequences'.
"Several researchers have demonstrated that the virtual behaviors committed in a video game can elicit feelings of guilt. Researchers have proposed that such guilt could have prosocial consequences. However, this proposition has not been supported with empirical evidence. The current study examined this issue in a 2×2 (video game play vs. real world recollection×guilt vs. control) experiment. Participants were first randomly assigned to either play a video game or complete a memory recall task. Next, participants were randomly assigned to either a guilt-inducing condition (game play as a terrorist/recall of acts that induce guilt) or a control condition (game play as a UN soldier/recall of acts that do not induce guilt). Results of the study indicate several important findings. First, the current results replicate previous research indicating that immoral virtual behaviors are capable of eliciting guilt. Second, and more importantly, the guilt elicited by game play led to intuition-specific increases in the salience of violated moral foundations. These findings indicate that committing "immoral" virtual behaviors in a video game can lead to increased moral sensitivity of the player. The potential prosocial benefits of these findings are discussed."