Can you teach a child remorse?

It is very difficult to create a simulated learning situation where the child can get the feeling of remorse.

To teach affective subjects, you need to model the behavior or expose the child to it. If something in their lives happens, take advantage of the moment to talk to them about it, which would probably be on an individual basis. For groups, the easiest would be to read a story with a character they would be sympathetic with, and then to discuss what the character felt.