In addition to suicide prevention (you can see my long comment to John), the high relapse rate from treatment centers/12 step programs is something I write about from time to time. https://marcus17043.medium.com/efficacy-of-12-step-programs-for-addiction-treatment-c111fbffc10a and https://medium.com/illumination/drilling-down-to-the-root-cause-of-addiction-7c57c5a3fd6c are two of my essays.