There's a certain stew that if you keep feeding them will hurt them. You have to look in the stew guide to go figure out what it is though.

I don't plan on doing it again, though. Unless I'm in desperate need of kids and have nothing but adults. (That was the one nice thing about the GC in VV1, always a child so you always had someone to pick mushrooms!) Cause I'd like to complete my collections.

I did do a bit of evil today, but not to kill anyone. I fed them the ill making stew because my doctors were bored and refused to study the plants. So I made a few villagers ill so the doctors could heal them and up their healing skills a bit. After treating about three people each the doctors were more willing to study the plants and stop being bored.