> Why should your drug use, or anyone else's, create obligations for other people to support you, treat you, and help you overcome addiction?

Replace drug use with something else and you get to the basic question of society. "Why should someone have to support someone else?" - a philosophical question. You have to decide for yourself what the answer is - for me it is simple: Because helping others is what society is all about, without that we are nothing more than individuals in an "everyone for himself!"-scenario, which doesn't strike me as the kind of place I want to live in.