They deal with self-harm by imparting coping mechanisms for dealing with intense emotions. If necessary, they also create a safety plan that includes triggers, coping mechanisms, and emergency plans. They occasionally check in with clients as well. Never do they criticize their clients for their actions; instead, they work with them to identify alternatives and address the feelings that led to the issue in the first place. It really isn't any different from using substances like alcohol, drugs, food, or purging to numb emotions.