The infants make sense, as a tribe would have a logical ecosystem, so where there are tribal men, there are tribal women and babies. Though it is not the most tasteful thing to see and some will object to it, it is the only way you can really show the consequences of the player's actions. If you do it right, and it is not gratuitous or exploitative, and there are consequences for the player's actions (perhaps showing survivors blaming you for letting them get slaughtered) it is fine with me. Go for it.