[yosito]

The answer to your question is that drugs are one of many possible coping mechanisms. One abuse victim copes with drugs, while another copes with Stockholm syndrome, and yet another with therapy. What separates the ones who fall down the hole from the ones who don't is a combination of opportunity, biology (people have different reactions to the same drugs), and choice. It's understandable that this leads people to questions of disease and moral failing. Questions of behavior and coping mechanisms require much more nuance.