I think its that real world experience with someone who had an addiction in your life that will change your worldview - my father is an opioid addict, and an alcoholic - and frankly, he managed to have both of these habits for 50 years and hold down a job, make a living, and (sort of) raise a child. He wasn't there when I was a kid - but I know he did the best job he knew how - even if it wasn't enough - and I can't fault him for it. Same with my mother, who was left emotionally kinda broken by her own childhood.

I've know many current and former addicts in my life - and I don't look at it as a character failing at all - its just an unfortunate luck of the draw when it comes to biology, genetics, and life experience.