Even if it was his own damn fault, treating drug addiction and abuse as illness and becoming more accepting that people fall into these traps as a society will result in more positive outcomes for everyone involved.
When it's an illness, and not a lack of willpower, those around the person don't feel as ashamed and guilty.
When it's an illness and not a lack of willpower people are more likely to be able to come to grips with the concept of seeking help.
When it's an illness and not a lack of willpower people are more likely to be supportive of providing treatment.
I, personally, do believe it's an illness as I believe (although someone could refute me on this) that even if it might be reversible, the affliction changes the nature of the brain's chemical balance.
That being said, even if it was just some person who was choosing day after day to slowly destroy themselves, they'd be a lot better off if society said "this isn't your fault" and offered them help.
Instead, I feel it's the other way around haha! It's probably altering brain chemistries every where and society is saying "stop being an asshole!". That really has to smart.
And on top of it all, putting so much pressure on the individual to succeed on their own probably causes a lot of the stressors that cause people to want a drink or escape in the first place.