Doesn't change the fact that the person, in most cases, had to make a choice to start taking the drugs.
It's not as if you wake up one day, and you're now instantly addicted to cocaine and are destroying your life. You had to make the choice to start using the drugs.
All people make small mistakes all the time, and usually can recover. Few of them involve falling into an abyss, but tasting meth or heroin or maybe crack are among them.
It's not like the second you've had meth or heroin for the first time you're instantly and irrevocably addicted to it. There's definitely an ability to recover from that.
It's not as if you wake up one day, and you're now instantly addicted to cocaine and are destroying your life. You had to make the choice to start using the drugs.