It sounds like you are very knowledgeable about the subject. You are correct on all grounds. Please don't forget that there is another option. You do not have to live with a drug addict. If by "live" you mean in the same home, make him leave. If by "live" you mean having them in your life, you don't have to do that, either. You have the option of going "no contact" until he decides to straighten himself out. He may never do that, but you will no longer have a front row seat to the drama.
Welcome to SR! You will find a lot of support here, and I look forward to reading your blog.