How to think about something you think is morally wrong

I am going through the “How to enjoy being you” Handbook. Day 6. “Write down what it is like to experience life in your mind as if nothing has ever gone wrong.”  I am a bit confused how to proceed applying this to something I believe is morally wrong. It feels pretty upsetting to think that a child being killed and how I experience that are for me. I wonder if I am misunderstanding what Brooke meant. Is it simply how I think about it? Are there some things that we experience for us as only a cautionary tale? Thanks.