I have sat with Attorneys that have gotten their clients into rehab, and helped with families, and negotiated settlements that included conditions of sobriety and restitution.
There are many that look at DUIs as just another criminal act. As defense attorneys, their job is to do everything legally possible to defend the client.
With an addict, this unfortunately is the ultimate example of enabling.
I really don't think its the attorneys responsibility, though. They are simply doing their job. It might actually be more codependent for them to worry about their clients substance issues. At the end of the day, its not really their business.