Children, like all other critters, should act and react in reasonably believable ways, to the extent possible, within the limits of the game envirionment. Why would it be otherwise? It would be also nice to have destructable terrain, but that too is subject to the limits of the game envirionment, programability, etc. Of course if the quest is about recovering all the missing children, the absolute absence of sub-adults might be explainable and the 'controversy' aborted