Because some limitations of the medical model have to do with environment and family history, this has a large influence on Marge's drinking. Marge lives in a stressful environment, is raising a family, has diabetes, is unemployed and has a difficult child to raise. Another aspect is that Marge suffers from depression and has a family history of alcoholism. It's not that Marge is weak or lacks willpower, it's the fact that Marge has an illness and needs help dealing with the whole thing, not just the medical part. To treat alcohol disease, you need to work on the underlying problems in question and the alcohol consumption that is used to cope with other problems.