The agency apparently wants to change that in the virtual world too and is urging developers to punish gamers who violate the Geneva Convention. Killing civilians, torture, and killing medical personnel are some of the things the ICRC is taking umbrage with, and addressed in a statement.
They write:
Gamers should be rewarded for respecting the law of armed conflict and there should be virtual penalties for serious violations of the law of armed conflict, in other words war crimes. This already exists in several conflict simulation games. Game scenarios should not reward players for actions that in real life would be considered war crimes.