If you fear you may harm the participants or yourself, this is again an issue to be discussed within the team. It may be down to a fear of your own emotional reaction, or it may concern uncertainty about the suitability of the chosen methods of work. If the fear is related to the methods, the training team should re-examine them and make a decision everyone feels comfortable with. Creating and running difficult experiential exercises is justified when it aims to provide an opportunity for insights to help us overcome or cope with such difficulties. The aim is not to make everyone feel good during the training, but that by the end of the training everyone will feel that the effort invested in dealing with difficult topics was meaningful.