It is interesting to watch parents try to reason with the children. While it is obvious that young children can be taught what they can and cannot do, it also seems to be true that until a child is six or seven, they cannot grasp clearly the meaning of right/wrong in the way adults do. As a result, a child can learn not to tear up the newspaper before daddy has read it, but the young child will not realize that there is something wrong about that. They need to grow up a bit more. I don't know what the answer is, but it has to be something else. I know from watching it day after day that the "Let's talk ethics" approach is not going to cut it with a child who can't yet say ethics without lisping.
It is a bit like people who think that speaking English loudly and slowly to a non-English speaker will make it intelligible. I mean, no matter how loudly and slowly someone spoke Chinese to me, I just wouldn't get it.
Anyway, as the Boy Scouts told you, Justin, Be Prepared.