I find it interesting that some people find violence to be acceptable to portray against adults in games but not children. There are some vile things expressed in games that if were to happen in real life we would recoil from, the point is that it's not real and we are all aware of that.
If you think about playing a game in which you kill hundreds of people singlehandedly, the value of their innocence or lack therof is somewhat diluted. The classic case being: Are you as the player character, worse than your opponent if to do something noble you had to murder several people who may or may not have been 'bad'?
Maybe faceless grunt #888 was 1 day from retirement after winning a bravery award from saving a litter of kittens and was thinking of his dear grand-ma-ma whilst slumped irreverently behind a chest-high wall, until he was brutally detonated by some wandering misanthrope on the hunt for Nazi gold. Was his imaginary life more or less valuable than an imaginary small child's? Who cares!!! Neither of them were real!!