The credits were sad and made me almost feel guilty for killing all the Villagers. Almost. Guess we'll never know for sure what happened to the children, but rather than them getting murdered by their parents, I get the impression it's more likely that the children died from neglect as the Las Plagas parasites took hold in their parents' bodies. For example we already know that since infection the villagers had lost all interest in basic hygeine, so I don't imagine they'd be too good at looking after kids either! Also perhaps the children were injected with the Las Plagas parasites as well, but their bodies were too small to cope with them and they died that way.