I still think you could probably throw the hobgoblin women and children at all of them.
Perhaps. But I would likely *position* it differently. See above - I was not going to run a game in which 13-year-olds end up on the wrong side of the moral argument. If I'm going to present the non-combatants as a challenge to kids, I'd position it clearly as a, "Well, nuts, you have to get around this without hurting anyone."
Heck, in games for my adults, if the PCs choose the wrong side of the moral argument, they are apt to be treated by the world like the monsters they have become - meaning that they have made it moral and ethical for others to kill the PCs and take their stuff!