I think the big problem is that a lot of people view drug addiction as a moral failing, and don't consider the societal, biological, and psychological aspects behind it. When it comes down to it, addiction is a mental illness, and mental illnesses are consistently stigmatized in our society. We certainly have come a long way, but people can be ridiculously ignorant.
Addicts are human beings struggling with some really tough stuff. They deserve treatment, especially life-saving treatment, just like everyone else. It saddens me that so many people lack basic empathy when it comes to addicts. On top of it, I get the sense that a lot of people who stigmatize addicts don't give a flying crap about the societal issues that more often than not help lead to addiction in the first place.