As much as I hate to contradict your feelpinions on the issue, there is actually a wealth of evidence gathered over decades that shows why stigmatisation is counterproductive to dealing with addictive behaviours:
Here, why don't you spend the morning exploring the literature for yourself? Hell, if you want to go deeper than the abstract of any particular paper then even unlock the paywall and email the PDF to you.
http://scholar.google.com.au/schola...&sa=X&ei=lpGcVOuSFYOgNsaEhKgD&ved=0CBoQgQMwAA
http://scholar.google.com.au/schola...a=X&ei=o5KcVK-YI5OAgwTyj4SgAQ&ved=0CBoQgQMwAA
In a nutshell, stigmatisation leads to lower self-esteem, which can result in mental and physical health problems, it generates health disparities, it discourages people from seeking treatment, it interferes with intervention efforts - just to name a few.
There is nothing good that comes from making people feel **** and hopeless about their situation - despite what your gut instincts might tell you. That's why there are entire fields of behavioural therapy associated with addiction treatment that involves trying to reverse the pernicious effects of self and social stigmatisation.