I play Minecraft with my 9 yr old nephew and he's a mostly
gentle soul with a really wicked cruel streak I try to point out
to him.
One day, we had some NPCs - they had names on their heads and
their professions. Not feeling in a peaceful mood, he rounded
them up to drop them in lava via a trap door in a cage.
So I walked around the cage and said, "Chris the Baker, you must
pay for your crimes...." and the like.
In the chat, nephew writes, "Oh, they didn't do anything wrong."
All I had to type back is: "Oh. "
Well, within a few minutes, he had modified the roleplay so that
he was the evil Wizard and I was to break them out when he had
his back turned.
*Much* better scenerio. I do what I can. I suspect he'll always
have a slight "revenge" streak in him, but if he's at least
aware of social implications [or just pretends around me], I'm
ok with that.