Self-destructive behavior
Treating people with self-desctrutive behavior is difficult. It often means that these people need to go through dfferent stages, to fully recover. For body-focused repetitive behaviors, such as trichotillomania there are therapies such as  habit reversal training and decoupling which seem to be effective. For behaviour involving alcohol and/or drugs there are rehabilitation places that can help to stop the behaviour. Medicines such as tranquilisers (calming medicines) and anti-depressant medications that may help especially if the cause is mental illness.