Personally, I don't care either way. But I don't see how, or why, killing children in a game is any different than killing anyone else in a game. If you're upset at the idea of blowing up a tot, you should get equally upset about running over hookers or innocent pedestrians in Grand Theft Auto, really harming anyone who isn't sprinting towards you with a gun, and yet everyone does it. I find that the idea that just because someone isn't an "adult" their lives are somehow worth or, or it's more of a tragedy if they die, is silly. It's like when books or games throw kids into the mix, and somehow everything is supposed to feel more tense just because a kid might get hurt or killed. Why doesn't an adult, someone who's already a contributing member of society, someone who has a family and friends as well, carry the same weight of emotion when under threat?
Maybe I'd feel differently if I were a mother, but I doubt it. It's not how I'd choose to play, and I'm not advocating infanticide in games, I'm just saying it doesn't bother me if other people do it. The idea that you can messily murder someone you pass on the street in a game but it's somehow suddenly OMG WRONG just because that someone is a child is ridiculous.