I think your idea is very good especially that parenthood already have a similar concept. Toddlers learn to be compassioned. Guilt is a great idea, but also should be something that would help with guilt. Maybe self forgiveness or therapy. What if the sims team would add a psychotherapy job. We have so many emotions in game, it would be very realistic that sims would feel guilty for things they have done and they would need a therapy to help them feel better. haha I love it